func_code_string: #include <bits/stdc++.h>   using namespace std;   const int INF = 2e9;   int n;   pair<int, int> p[25];   int dis[25][25];   int dp[1 << 24 | 1];   int pre[1 << 24 | 1];   int main() {     scanf( %d%d%d , &p[0].first, &p[0].second, &n);     for (int i = 1; i <= n; ++i) {       scanf( %d%d , &p[i].first, &p[i].second);     }     for (int i = 0; i <= n; ++i)       for (int j = i; j <= n; ++j) {         dis[i][j] = dis[j][i] =             pow(p[i].first - p[j].first, 2) + pow(p[i].second - p[j].second, 2);       }     for (int m = 1; m < (1 << n); ++m) {       dp[m] = INF;     }     dp[0] = 0;     for (int m = 0; m < (1 << n); ++m) {       if (dp[m] == INF) continue;       for (int i = 1; i <= n; ++i) {         if (m & 1 << (i - 1)) continue;         for (int j = 1; j <= n; ++j) {           if (m & 1 << (j - 1)) continue;           if (dp[m | (1 << i - 1) | (1 << j - 1)] >               dp[m] + dis[0][i] + dis[i][j] + dis[j][0]) {             dp[m | (1 << i - 1) | (1 << j - 1)] =                 dp[m] + dis[0][i] + dis[i][j] + dis[j][0];             pre[m | (1 << i - 1) | (1 << j - 1)] = m;           }         }         break;       }     }     printf( %d n , dp[(1 << n) - 1]);     int num = (1 << n) - 1;     while (num) {       printf( 0  );       int t = pre[num] ^ num;       for (int i = 0; i < n; ++i) {         if (t & (1 << i)) {           printf( %d  , i + 1);         }       }       num = pre[num];     }     printf( 0 n );     return 0;   }   