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  1. #include <iostream>
  2. using namespace std;
  3. #define ll long long
  4.  
  5. int main()
  6. {
  7.     int n;
  8.     cin >> n;
  9.     ll arr[n][n];
  10.     int i, j;
  11.     int row = 10000, col = 10000;
  12.     for(i = 0; i < n; i++) {
  13.         for(j = 0; j < n; j++) {
  14.             cin >> arr[i][j];
  15.             if(arr[i][j] == 0) {
  16.                 row = i;
  17.                 col = j;
  18.             }
  19.         }
  20.     }
  21.     ll sumR = 0, sumR2 = 0;
  22.     ll sumC = 0, sumC2 = 0;
  23.     ll sumD = 0, sumD2 = 0;
  24.     int flag = 0;
  25.     int exec = 0;
  26.     for(i = 0; i < n; i++) {
  27.         if(i != row) {
  28.  
  29.             for(j = 0; j < n; j++)
  30.                 sumR += arr[i][j];
  31.             if(exec != 0) {
  32.                 if(sumR != sumR2) {
  33.                     flag = 1;
  34.                     break;
  35.                 }
  36.             }
  37.  
  38.                 sumR2 = sumR;
  39.                 sumR = 0;
  40.  
  41.             exec++;
  42.         }
  43.     }
  44.     //cout << row << " " << col << endl;
  45.     exec = 0;
  46.     for(j = 0; j < n; j++) {
  47.         if(j != col) {
  48.             //cout << i << " " << j << endl;
  49.             for(i = 0; i < n; i++)
  50.                 sumC += arr[i][j];
  51.             //cout << sumC << " " << sumC2 << endl;
  52.             if(exec != 0) {
  53.                 if(sumC != sumC2) {
  54.                     flag = 1;
  55.                     break;
  56.                 }
  57.             } 
  58.                 sumC2 = sumC;
  59.                 sumC = 0;
  60.  
  61.             exec++;
  62.             //cout << sumC << " " << sumC2 << endl;
  63.         }
  64.     }
  65.     int flag2 = 0;
  66.     for(i = 0, j = 0; i < n && j < n; i++, j++) {
  67.         if(i == row && j == col) {
  68.             sumD = 0;
  69.             flag2 = 1;
  70.             break;
  71.         } else {
  72.             sumD += arr[i][j];
  73.         }
  74.         //cout << sumD << " ";
  75.     }
  76.     for(i = 0, j = n-1; i < n && j >= 0; i++, j--) {
  77.         if(i == row && j == col) {
  78.             sumD2 = 0;
  79.             flag2 = 2;
  80.             break;
  81.         } else {
  82.             sumD2 += arr[i][j];
  83.         }
  84.         //cout << endl << sumD2 << " ";
  85.     }
  86.     //cout << endl;
  87.     ll ans = 0;
  88.     ll s = 0;
  89.     if(flag2 == 0) {
  90.         if(sumR2 == sumC2 && sumR2 == sumD && sumR2 == sumD2) {
  91.             //ll s = 0;
  92.             for(j = 0; j < n; j++)
  93.                 s += arr[row][j];
  94.             ans = sumR2 - s;
  95.  
  96.  
  97.         }
  98.         //cout << ans << " " << s << endl;
  99.     } else if(flag2 == 1) {
  100.           if(sumR2 == sumC2 && sumR2 == sumD2) {
  101.             //ll s = 0;
  102.             for(j = 0; j < n; j++)
  103.                 s += arr[row][j];
  104.             ans = sumR2 - s;       
  105.         }
  106.         //cout << ans << " " << s << endl;      
  107.     } else if(flag2 == 2) {
  108.             if(sumR2 == sumC2 && sumR2 == sumD) {
  109.             //ll s = 0;
  110.             for(j = 0; j < n; j++)
  111.                 s += arr[row][j];
  112.             ans = sumR2 - s;
  113.  
  114.  
  115.         }
  116.         //cout << ans << " " << s << endl;
  117.     }
  118.     //cout << sumR2 << " " << sumC2 << " " << sumD << " " << sumD2 << " " << flag << " " << flag2 << " " << ans << " " << s << endl;
  119.     if(flag == 0  && ans > 0) {
  120.         cout << ans << endl;
  121.     } else
  122.         cout << "-1" << endl;
  123.     //cout << flag << ans;
  124.     return 0;
  125. }
Runtime error #stdin #stdout 0s 3468KB
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https://ideone.com/6HDQwQ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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