C++ の動作確認をしてみた（８５２）

C++の練習を兼ねて, AtCoder Regular Contest 135 の問題D (Add to Square) を解いてみた.

■感想.
1. 問題D は, 方針が見えなかったので, 解説を参考に, AC版に到達できたと思う.
2. 実装に苦労したものの, 個人的には, 操作後のマス目の状態を抽出できる解説のロジックが, 非常に不思議な印象を受けた.
3. 引き続き, 時間を見つけて, 過去問の学習を進めていきたいと思う.

本家のサイト AtCoder Regular Contest 135 解説の各リンクをご覧下さい.

■C++版プログラム(問題D／AC版).

// 解き直し.
// https://atcoder.jp/contests/arc135/editorial/3381
// C++(GCC 9.2.1)
#include <bits/stdc++.h>
using namespace std;
using LL = long long;
using vl = vector<LL>;
using vvl = vector<vl>;
#define repex(i, a, b, c) for(int i = a; i < b; i += c)
#define repx(i, a, b) repex(i, a, b, 1)
#define rep(i, n) repx(i, 0, n)
#define repr(i, a, b) for(int i = a; i >= b; i--)
LL a[505][505], rSum[505], cSum[505], o1[505][505], o2[505][505], o3[505][505], o4[505][505], ans[505][505];

int main(){
    
    // 1. 入力情報.
    int H, W;
    scanf("%d %d", &H, &W);
    rep(i, H){
        rep(j, W){
            scanf("%lld", &a[i][j]);
            
            // (-1) の (i + j)乗 を 考慮.
            if((i + j) & 1) a[i][j] *= -1;
        }
    }
    
    // 2. 各行, 列の合計.
    rep(i, H) rep(j, W) rSum[i] += a[i][j];
    rep(j, W) rep(i, H) cSum[j] += a[i][j];
    
    // 3. 分類.
    // 3-1. 操作 1, 操作 2.
    rep(i, H){
        rep(j, W){
            if(rSum[i] < 0 && cSum[j] < 0) ++o1[i][j];
            if(rSum[i] > 0 && cSum[j] > 0) ++o2[i][j];
        }
    }
    
    // 3-2. 操作 3.
    rep(i, H) repx(j, i + 1, H) if((rSum[i] > 0 && rSum[j] < 0) || (rSum[i] < 0 && rSum[j] > 0)) ++o3[i][j];
    
    // 3-3. 操作 4.
    rep(i, W) repx(j, i + 1, W) if((cSum[i] > 0 && cSum[j] < 0) || (cSum[i] < 0 && cSum[j] > 0)) ++o4[i][j];
    
    // 4. 操作.
    // 4-1. 操作 1, 操作 2.
    rep(i, H){
        int wMax = 0;
        rep(j, W){
            if(rSum[i] != 0){
                if(o1[i][j] || o2[i][j]){
                    LL x = rSum[i];
                    LL y = cSum[j];
                    if(abs(x) <= abs(y)){
                        rSum[i] -= x;
                        cSum[j] -= x;
                        ans[i][j] -= x;
                    }
                    if(abs(x) > abs(y)){
                        rSum[i] -= y;
                        cSum[j] -= y;
                        ans[i][j] -= y;
                    }
                }
                
                // 更新最終列.
                wMax = j;
            }
        }
        
        // i行目の総和が, 0 か？
        if(rSum[i] != 0){
            LL res = rSum[i];
            rSum[i] -= res;
            cSum[wMax] -= res;
            ans[i][wMax] -= res;
        }
    }
    
    // 4-2. 操作 3.
    rep(i, H){
        repx(j, i + 1, H){
            if(o3[i][j]){
                LL x1 = rSum[i];
                LL x2 = rSum[j];
                if((x1 > 0 && x2 < 0) || (x2 > 0 && x1 < 0)){
                    if(abs(x1) <= abs(x2)){
                        rSum[i] -= x1;
                        rSum[j] += x1;
                        ans[i][0] -= x1;
                        ans[j][0] += x1;
                    }
                    if(abs(x1) > abs(x2)){
                        rSum[i] += x2;
                        rSum[j] -= x2;
                        ans[i][0] += x2;
                        ans[j][0] -= x2;
                    }
                }
            }
        }
    }
    
    // 4-3. 操作 4.
    rep(i, W){
        repx(j, i + 1, W){
            if(o4[i][j]){
                LL y1 = cSum[i];
                LL y2 = cSum[j];
                if((y1 > 0 && y2 < 0) || (y2 > 0 && y1 < 0)){
                    if(abs(y1) <= abs(y2)){
                        cSum[i] -= y1;
                        cSum[j] += y1;
                        ans[0][i] -= y1;
                        ans[0][j] += y1;
                    }
                    if(abs(y1) > abs(y2)){
                        cSum[i] += y2;
                        cSum[j] -= y2;
                        ans[0][i] += y2;
                        ans[0][j] -= y2;
                    }
                }
            }
        }
    }
    
    // 5. 符号の反映.
    LL t = 0;
    rep(i, H){
        rep(j, W){
            // (-1) の (i + j + 1)乗 を 考慮.
            if((i + j + 1) & 1) ans[i][j] *= -1;
            
            // 集計.
            t += abs(ans[i][j]);
        }
    }
    
    // 6. 出力.
    printf("%lld\n", t);
    rep(i, H) rep(j, W) printf("%lld%s", ans[i][j], (j < W - 1) ? " " : "\n");
    return 0;
    
}

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// 解き直し.

// https://atcoder.jp/contests/arc135/editorial/3381

// C++(GCC 9.2.1)

#include <bits/stdc++.h>

using namespace std;

using LL = long long;

using vl = vector<LL>;

using vvl = vector<vl>;

#define repex(i, a, b, c) for(int i = a; i < b; i += c)

#define repx(i, a, b) repex(i, a, b, 1)

#define rep(i, n) repx(i, 0, n)

#define repr(i, a, b) for(int i = a; i >= b; i--)

LL a[505][505], rSum[505], cSum[505], o1[505][505], o2[505][505], o3[505][505], o4[505][505], ans[505][505];

int main(){

// 1. 入力情報.

int H, W;

scanf("%d %d", &H, &W);

rep(i, H){

rep(j, W){

scanf("%lld", &a[i][j]);

// (-1) の (i + j)乗を考慮.

if((i + j) & 1) a[i][j] *= -1;

}

// 2. 各行, 列の合計.

rep(i, H) rep(j, W) rSum[i] += a[i][j];

rep(j, W) rep(i, H) cSum[j] += a[i][j];

// 3. 分類.

// 3-1. 操作 1, 操作 2.

rep(i, H){

rep(j, W){

if(rSum[i] < 0 && cSum[j] < 0) ++o1[i][j];

if(rSum[i] > 0 && cSum[j] > 0) ++o2[i][j];

}

// 3-2. 操作 3.

rep(i, H) repx(j, i + 1, H) if((rSum[i] > 0 && rSum[j] < 0) || (rSum[i] < 0 && rSum[j] > 0)) ++o3[i][j];

// 3-3. 操作 4.

rep(i, W) repx(j, i + 1, W) if((cSum[i] > 0 && cSum[j] < 0) || (cSum[i] < 0 && cSum[j] > 0)) ++o4[i][j];

// 4. 操作.

// 4-1. 操作 1, 操作 2.

rep(i, H){

int wMax = 0;

rep(j, W){

if(rSum[i] != 0){

if(o1[i][j] || o2[i][j]){

LL x = rSum[i];

LL y = cSum[j];

if(abs(x) <= abs(y)){

rSum[i] -= x;

cSum[j] -= x;

ans[i][j] -= x;

}

if(abs(x) > abs(y)){

rSum[i] -= y;

cSum[j] -= y;

ans[i][j] -= y;

}

// 更新最終列.

wMax = j;

}

// i行目の総和が, 0 か？

if(rSum[i] != 0){

LL res = rSum[i];

rSum[i] -= res;

cSum[wMax] -= res;

ans[i][wMax] -= res;

}

// 4-2. 操作 3.

rep(i, H){

repx(j, i + 1, H){

if(o3[i][j]){

LL x1 = rSum[i];

LL x2 = rSum[j];

if((x1 > 0 && x2 < 0) || (x2 > 0 && x1 < 0)){

if(abs(x1) <= abs(x2)){

rSum[i] -= x1;

rSum[j] += x1;

ans[i][0] -= x1;

ans[j][0] += x1;

}

if(abs(x1) > abs(x2)){

rSum[i] += x2;

rSum[j] -= x2;

ans[i][0] += x2;

ans[j][0] -= x2;

}

// 4-3. 操作 4.

rep(i, W){

repx(j, i + 1, W){

if(o4[i][j]){

LL y1 = cSum[i];

LL y2 = cSum[j];

if((y1 > 0 && y2 < 0) || (y2 > 0 && y1 < 0)){

if(abs(y1) <= abs(y2)){

cSum[i] -= y1;

cSum[j] += y1;

ans[0][i] -= y1;

ans[0][j] += y1;

}

if(abs(y1) > abs(y2)){

cSum[i] += y2;

cSum[j] -= y2;

ans[0][i] += y2;

ans[0][j] -= y2;

}

// 5. 符号の反映.

LL t = 0;

rep(i, H){

rep(j, W){

// (-1) の (i + j + 1)乗を考慮.

if((i + j + 1) & 1) ans[i][j] *= -1;

// 集計.

t += abs(ans[i][j]);

}

// 6. 出力.

printf("%lld\n", t);

rep(i, H) rep(j, W) printf("%lld%s", ans[i][j], (j < W - 1) ? " " : "\n");

return 0;

}

[入力例]
2 3
1 2 3
4 5 6

[出力例]
9
0 -3 -1
3 0 2
※AtCoderのテストケースより

[入力例]
2 2
1000000000 -1000000000
-1000000000 1000000000

[出力例]
4000000000
2000000000 0
0 2000000000
※AtCoderのテストケースより

[入力例]
3 4
0 2 0 -2
-3 -1 2 0
-3 -3 2 2

[出力例]
0
0 0 0 0
0 0 0 0
0 0 0 0
※AtCoderのテストケースより

[入力例]
3 4
1 3 2 5
2 5 1 3
7 3 5 1

[出力例]
18
0 1 0 4
-5 0 0 0
1 0 6 -1

[入力例]
4 5
1 -2 3 4 -5
6 7 8 -9 10
2 -3 4 5 6
7 8 -9 10 11

[出力例]
66
-3 -1 8 0 -9
7 0 0 -8 11
0 -10 0 0 0
0 9 0 0 0

[入力例]
7 10
7 10 -12 10 11 -18 11 9 2 6
13 7 13 3 3 18 13 -7 9 6
18 11 -8 12 11 -10 8 14 0 17
10 7 11 9 13 10 6 9 -6 10
22 -15 1 -5 -14 13 0 1 12 3
20 0 17 2 5 10 19 25 -12 7
12 21 -6 -6 4 -12 11 9 -8 2

[出力例]
206
2 0 -34 0 -9 -47 -8 6 15 5
0 -13 11 0 0 0 0 0 0 0
0 0 -15 0 0 0 0 0 0 0
-11 0 0 0 0 0 0 0 0 0
3 0 0 -3 0 -18 0 0 0 0
0 0 5 0 0 0 0 0 0 0
0 0 -1 0 0 0 0 0 0 0

[入力例]
11 13
-81 15 71 2 -98 76 82 -40 -60 29 72 -88 90
36 66 28 -62 -54 64 -12 16 56 -63 -1 -50 -23
-81 -48 51 -37 77 -66 -33 -115 -78 8 36 28 -56
-105 -17 81 97 -70 88 17 51 50 -88 26 -69 26
66 -101 88 116 109 -62 15 -111 35 77 -20 -10 118
-103 -50 55 -10 61 81 -6 -64 -32 -121 -76 -12 67
96 -118 -29 -98 10 -97 -92 61 -9 3 -22 -107 -19
95 54 90 81 58 35 -45 113 -56 -22 -64 -122 98
84 69 -120 -11 123 69 -117 15 82 -63 99 37 71
110 15 -63 -123 97 113 21 -19 -115 -66 -72 -120 -39
39 38 -17 -23 -77 65 -103 59 9 -58 -34 61 22

[出力例]
2524
82 0 0 0 0 0 0 0 0 46 243 294 97
0 0 59 0 0 0 0 0 0 0 0 0 0
8 -138 0 0 0 0 0 0 0 0 0 0 0
0 37 0 0 0 0 0 0 0 0 0 0 0
0 -38 0 -34 52 -378 0 0 0 0 0 0 0
0 0 88 0 0 0 54 0 0 0 0 0 0
0 0 0 0 0 -18 0 -228 45 0 0 0 0
0 0 0 0 0 0 37 0 0 0 0 0 0
0 0 0 0 0 0 0 0 31 0 75 0 0
0 0 0 0 0 0 132 0 0 -7 0 0 0
0 0 0 0 0 0 0 0 0 303 0 0 0

[入力例]
20 22
-1901 -8626 -7663 -1030 1536 2767 1835 8925 709 1856 8515 -7283 -5161 9289 1256 1769 1582 -7961 -1765 5605 -5709 -1182
5956 -5305 -7753 -718 -8771 -9760 -9201 -1816 6573 2061 -1222 -7185 1126 -3599 212 -5582 -8987 -3713 -2281 9572 6851 -9210
6385 -1075 -3196 -2612 7087 1501 2806 -6331 3812 182 3918 -2102 980 -5110 -3217 -9100 8725 -8757 6277 -1237 -3818 1931
1918 6290 -5500 8719 -7779 -9918 -1061 -5121 2885 -9225 -1325 7992 -8115 -1851 -7827 -2091 -7820 -1951 8205 -1637 -999 -7792
-1691 7737 8620 128 2211 1089 -7957 -181 -9958 1912 2788 1882 7788 -1169 7126 -7122 -3631 -7231 6591 -676 3591 1120
3237 2995 3628 9657 -9556 6763 268 3567 -6026 1713 1710 -2272 -9331 5575 1020 -1121 -7925 -6802 8917 -130 2336 171
1273 -2202 8962 1251 9660 7721 -2531 -7978 -2893 1565 557 7188 -917 5131 -3132 -7210 2031 -9555 -9711 9215 -975 -238
5360 -6119 6151 3012 -2615 9951 1721 5510 -5212 6169 8380 5121 -9082 7116 -8261 1229 -8810 -9063 6689 9118 -8753 1991
159 -2763 -2170 3802 2996 2392 -312 -1636 7211 5756 -1661 -2337 1110 -3171 8689 -5966 -6810 -1917 3591 -3079 2255 6386
-3661 -8877 5780 -9561 812 -8151 -1725 1728 -5017 -1875 -7318 -8910 -1595 8187 -2367 -5873 -2855 1180 -8081 -1158 2922 7992
7106 -1022 7118 -2881 -2931 7878 2986 7187 73 -5637 -620 8128 1803 -9835 1529 -806 1111 -3963 108 -5059 -1759 -1183
1860 -1871 -1150 -3873 -18 -7002 1663 -775 -9318 -1690 2275 1626 -3805 -7996 -258 9266 6363 -6370 -7226 518 72 -193
-9275 2029 -7779 -7915 -3319 8902 -1276 3112 -2581 -2115 -7776 -2119 -587 -1151 7350 -9798 3599 9211 -1516 -2531 3011 -5266
6680 -921 1338 -5866 -9713 -621 3117 -160 351 6801 8177 6021 -372 -7172 -3822 756 3027 1003 7593 -9662 -8336 9695
-6316 -7796 -1725 9533 -3181 -698 6863 3033 -9761 -9972 -1931 -1515 3595 -952 9035 -2198 -8793 1711 -5736 3185 -8583 -3997
-3019 3301 -8613 9511 -711 -6038 -2736 8393 9711 1325 1180 1309 1259 9151 7263 1265 -1901 -739 -818 -9901 -3812 3918
-5887 7182 -8770 1517 6105 232 2118 5191 -1819 8521 -9512 -7599 -9961 -7185 126 -2650 -6921 1797 7135 5158 -7291 -2113
1685 1100 -2097 -9796 -7157 6196 7131 -7520 1679 3810 2015 -7926 8832 -1113 -6221 -5712 -1396 -3613 -1163 2928 1087 -1173
-7112 -9828 -1826 -2532 7235 -5829 6752 3306 -8525 317 9111 -9588 8618 2109 -6125 -9616 -7126 995 1056 7613 8353 5271
-2520 388 -3667 -8826 -3711 2712 3107 -1525 -5860 9990 -8036 -2278 -9559 -1690 5507 631 8273 8817 2116 6150 -3862 -6027

[出力例]
443074
-10895 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
17758 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 -7345 3454 0 51670 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 -10833 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 14115 0 3874 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 -5126 0 0 16694 0 8843 -1175 0 0 0 0 0 0 0 0 0
-2564 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 -36735 11732 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 -6920 10671 0 0 0 0 0 0 0
2213 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 23717 0 0 0 0 0 0 0
1325 0 0 -7002 0 -491 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 12508 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 -8166 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 16867 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 -3003 20689 0 0 0 0 0 0
0 0 0 0 0 3791 0 12347 -13498 0 -2447 0 0 0 0 0 0 0 -7921 4724 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -7672 0 -19542
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -24776 3417 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -2381 4419 0 0 -1569 18185

[入力例]
30 33
-88 -128 -368 -58 -315 168 -5 -837 -390 398 509 235 -202 825 -598 -755 306 357 -131 -778 905 -771 285 -587 -291 298 -162 852 361 -802 -561 -109 -512
100 752 -235 -583 -60 -852 591 -652 -367 205 65 -109 -733 -699 -820 876 -299 105 -582 285 -691 -659 -120 352 31 -33 -508 -59 -151 -772 -270 958 -797
-565 -650 -921 881 -970 162 328 936 602 555 -987 558 -637 -83 725 -687 859 581 -893 -682 857 799 722 -536 -233 933 537 587 -637 926 956 -982 -975
235 -229 -367 953 832 -373 266 123 -86 806 -868 57 -883 -190 -526 -1000 -52 551 611 -765 -162 -751 607 -657 351 -756 -826 -206 -226 -353 835 -158 -392
-512 -376 121 -873 -331 -321 -862 -252 776 595 756 -578 527 -655 953 -757 -386 782 -586 313 -993 -122 -758 558 -657 565 751 159 -896 388 103 -855 227
-515 -516 966 -277 -52 -825 855 90 123 159 759 -568 -871 -959 798 922 863 -715 500 296 -6 -503 -526 95 -753 -528 -235 -113 -236 -352 -682 -553 -399
-735 -126 73 -37 -63 -961 186 -551 -970 859 -300 577 -553 -151 937 -958 -620 -555 708 858 -863 801 670 795 -838 250 -659 -808 -252 358 972 523 715
979 278 682 255 -850 758 -505 558 65 -233 -258 -398 252 -659 -360 -52 553 -515 -577 -591 -259 -376 897 927 885 -831 -516 -300 316 -6 199 359 595
530 -155 378 -216 786 357 885 15 739 529 851 725 -277 665 -890 -528 802 835 552 -258 222 -237 987 -713 55 -918 708 890 -567 -89 -931 929 -322
-535 -528 -387 718 920 -555 77 28 820 -152 -396 985 -260 553 -153 -553 128 -662 839 570 715 262 -671 285 371 505 -153 -252 26 -319 -101 276 258
212 -382 -22 56 -100 -858 -782 553 156 582 967 575 23 -700 855 95 872 -816 533 -291 -615 -898 -259 973 -738 -866 -555 605 507 269 865 833 113
-556 691 -533 -205 -232 -661 75 508 538 -277 -156 513 -866 -125 -628 -522 -555 -615 -172 -319 170 -316 755 -252 825 -821 -676 225 109 535 595 78 29
-390 -896 -625 757 289 -599 572 -906 112 -775 -813 233 -708 -956 -575 591 655 -786 -898 -662 -779 -933 935 -801 361 553 297 -775 -657 385 988 665 362
-875 115 -637 -587 331 200 -983 -653 255 183 776 761 613 31 -8 -858 -502 531 127 -89 875 -319 -977 529 502 565 -329 -389 928 -650 370 369 956
-221 655 71 -308 368 527 377 -500 955 -188 923 -785 636 -150 11 65 359 767 -771 958 -228 90 -536 205 -650 319 -30 -596 228 -513 538 -5 523
958 890 -399 738 -61 -57 -225 -950 532 755 829 -283 693 -539 516 -157 -630 -685 -293 -596 277 -590 -770 -395 550 -892 189 -8 -153 -920 666 373 -593
-620 875 -350 75 -980 937 602 -537 -571 879 323 530 962 503 -627 -717 878 -136 -555 835 -763 -358 -511 -685 -578 -765 -280 95 -880 885 331 -56 -831
-272 -952 735 -505 -637 759 957 587 870 150 228 -889 828 559 -552 -515 -297 -156 261 -155 -178 695 521 138 -663 193 -76 -52 -338 -992 950 97 -201
-653 -658 -869 695 553 -596 -75 -825 855 107 -92 527 531 -903 -552 -370 -1000 -653 279 -835 560 -255 -651 525 653 67 556 201 -569 -538 -755 -85 -668
-576 -565 -551 -5 528 576 93 -275 -988 -665 -795 -711 285 -535 577 -988 -15 650 671 -327 -568 235 -568 -569 -850 -979 -502 88 659 836 -251 29 -698
-198 556 -197 93 -233 529 -823 57 529 795 230 265 337 695 265 51 190 835 -296 91 -655 -171 -619 -852 -966 650 -372 666 -36 698 -216 -518 777
36 -91 -335 51 -675 -595 -669 775 -785 -702 607 315 783 728 388 268 955 655 -273 505 -937 521 958 321 833 587 -537 -259 506 828 -777 157 916
975 -671 -755 193 -783 -365 -356 -16 -352 819 -865 583 323 -25 -230 -280 66 -11 -885 860 -876 -80 838 -868 -713 -623 -255 -671 713 753 225 -20 263
-788 686 -31 907 -598 -35 -209 -527 501 565 659 250 99 -263 587 173 -30 -365 156 251 707 295 -96 718 -736 -500 207 -870 -975 -259 913 903 -893
-63 -262 25 258 -663 -583 631 570 -268 -952 -599 117 502 738 -700 116 179 580 -518 508 -113 -759 713 765 851 218 -802 -502 -600 -873 -815 822 -596
-91 -712 800 137 -518 560 -286 -505 288 -971 776 -380 520 155 921 -196 593 606 957 912 26 -552 790 796 -123 -589 815 230 -915 -690 -705 -855 839
319 -222 53 336 -231 952 535 570 310 -311 -690 612 555 550 -550 865 605 -32 178 15 -835 -605 118 -357 -557 -583 -900 -569 -959 -592 -957 556 102
979 527 -75 -697 39 -675 961 -52 987 137 387 365 282 -905 -70 -868 -787 767 -39 582 289 -551 -289 930 -622 185 -171 710 -101 -595 587 -567 -920
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1 2 3

4 5 6

[出力例]

0 -3 -1

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※AtCoderのテストケースより

[入力例]

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1000000000 -1000000000

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[出力例]

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※AtCoderのテストケースより

[入力例]

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[出力例]

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※AtCoderのテストケースより

[入力例]

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[出力例]

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[出力例]

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[入力例]

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■参照サイト
AtCoder Regular Contest 135

C++の練習を兼ねて, AtCoder Regular Contest 135 の 問題D (Add to Square) を解いてみた.

コメントを残す コメントをキャンセル

C++の練習を兼ねて, AtCoder Regular Contest 135 の問題D (Add to Square) を解いてみた.

コメントを残すコメントをキャンセル