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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int N, mat[51][51], sum = 0, sumMax = -250000;
  6.     cin >> N;
  7.     for (int i = 1; i <= N; ++i) {
  8.         for (int j = 1; j <= N; ++j) {
  9.             cin >> mat[i][j];
  10.         }
  11.     }
  12.     for (int j = N; j >= 1; --j) {
  13.         int row = 1, col = j;
  14.         while (row <= N && col <= N) {
  15.             sum += mat[row][col];
  16.             ++row;
  17.             ++col;
  18.         }
  19.         if (sum > sumMax) {
  20.             sumMax = sum;
  21.         }
  22.         sum = 0;
  23.     }
  24.     for (int i = 2; i <= N; ++i) {
  25.         int row = i, col = 1;
  26.         while (row <= N && col <= N) {
  27.             sum += mat[row][col];
  28.             ++row;
  29.             ++col;
  30.         }
  31.         if (sum > sumMax) {
  32.             sumMax = sum;
  33.         }
  34.         sum = 0;
  35.     }
  36.     for (int i = N - 1; i >= 1; --i) {
  37.         int row = 1, col = N - i;
  38.         while (row <= N - i && col <= N) {
  39.             sum += mat[row][col];
  40.             ++row;
  41.             --col;
  42.         }
  43.         if (sum > sumMax) {
  44.             sumMax = sum;
  45.         }
  46.         sum = 0;
  47.     }
  48.     for (int i = 1; i <= N; ++i) {
  49.         int row = i, col = N;
  50.         while (row <= N && col <= N) {
  51.             sum += mat[row][col];
  52.             ++row;
  53.             --col;
  54.         }
  55.         if (sum > sumMax) {
  56.             sumMax = sum;
  57.         }
  58.         sum = 0;
  59.     }
  60.     cout << sumMax;
  61.     return 0;
  62. }
Success #stdin #stdout 0.01s 5236KB
comments (?)
stdin
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4 
21 22 35 46
57 62 73 89
19 10 11 12
13 14 15 16
stdout
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142
https://ideone.com/Fp1Rsk
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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