func_code_string: #include <bits/stdc++.h>   using namespace std;   inline int read() {     int x = 0, f = 1;     char ch = getchar();     while (!(ch >=  0  && ch <=  9 )) {       if (ch ==  - ) f = -1;       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) {       x = x * 10 + (ch -  0 );       ch = getchar();     }     return x * f;   }   void chkmin(int &a, int b) {     if (b < a) a = b;   }   const int N = 81;   const int INF = 88888888;   int n;   int dp[N][N][N][3];   char s[N];   vector<int> V, K, O;   int calc(int pos, int a, int b, int c) {     int ret = 0;     for (int i = 1; i <= pos - 1; i++) {       if (s[i] ==  V ) {         if (a)           a--;         else           ++ret;       }       if (s[i] ==  K ) {         if (b)           b--;         else           ++ret;       }       if (s[i] !=  V  && s[i] !=  K ) {         if (c)           c--;         else           ++ret;       }     }     return ret;   }   int main() {     n = read();     scanf( %s , s + 1);     for (int i = 1; i <= n; i++) {       if (s[i] ==  V )         V.push_back(i);       else if (s[i] ==  K )         K.push_back(i);       else         O.push_back(i);     }     for (int a = 0; a <= n; a++)       for (int b = 0; b <= n; b++)         for (int c = 0; c <= n; c++)           for (int d = 0; d <= 1; d++) dp[a][b][c][d] = INF;     dp[0][0][0][0] = 0;     for (int a = 0; a <= V.size(); a++) {       for (int b = 0; b <= K.size(); b++) {         for (int c = 0; c <= O.size(); c++) {           for (int flag = 0; flag <= 1; flag++) {             if (a < V.size())               chkmin(dp[a + 1][b][c][1], dp[a][b][c][flag] + calc(V[a], a, b, c));             if (b < K.size() && !flag)               chkmin(dp[a][b + 1][c][0], dp[a][b][c][flag] + calc(K[b], a, b, c));             if (c < O.size())               chkmin(dp[a][b][c + 1][0], dp[a][b][c][flag] + calc(O[c], a, b, c));           }         }       }     }     printf( %d n , min(dp[V.size()][K.size()][O.size()][0],                        dp[V.size()][K.size()][O.size()][1]));     return 0;   }   