func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 305;   const int inf = 0x3f3f3f3f;   const double eps = 1e-5;   int n, c;   int dp[605][N][N], a[N][N];   int max(int a, int b, int c, int d) { return max(max(a, b), max(c, d)); }   int main() {     int n;     scanf( %d , &n);     for (int i = 1; i <= n; i++)       for (int j = 1; j <= n; j++) scanf( %d , &a[i][j]);     memset(dp, -inf, sizeof(dp));     dp[0][1][1] = a[1][1];     int l = (n - 1) * 2;     for (int i = 1; i <= l; i++) {       for (int j = 1; j <= n; j++) {         for (int k = 1; k <= n; k++) {           if (k == j)             c = a[j][i + 2 - j];           else             c = a[j][i + 2 - j] + a[k][i + 2 - k];           dp[i][j][k] = max(dp[i - 1][j - 1][k - 1], dp[i - 1][j][k - 1],                             dp[i - 1][j - 1][k], dp[i - 1][j][k]) +                         c;         }       }     }     printf( %d n , dp[l][n][n]);     return 0;   }   