func_code_string: #include <bits/stdc++.h>   const long long INF = 0x3f3f3f3f;   using namespace std;   void sol() {     long long n, m;     while (cin >> n >> m) {       string s;       cin.ignore();       cin >> s;       long long x[6][n];       string a[6] = { abc ,  acb ,  bca ,  bac ,  cab ,  cba };       memset(x, 0, sizeof(x));       ;       for (long long i = 0; i < s.size(); i++) {         if (i) {           for (long long j = 0; j < 6; j++) {             x[j][i] = x[j][i - 1];             if (s[i] != a[j][i % 3]) x[j][i]++;           }         } else {           for (long long j = 0; j < 6; j++) {             x[j][i] = 0;             if (s[i] != a[j][i % 3]) x[j][i]++;           }         }       }       while (m--) {         long long a, b;         cin >> a >> b;         long long ans = INF;         if (a > 1) {           for (long long i = 0; i < 6; i++) {             ans = (x[i][b - 1] - x[i][a - 2] < ans ? x[i][b - 1] - x[i][a - 2]                                                    : ans);           }         } else {           for (long long i = 0; i < 6; i++) {             ans = (x[i][b - 1] < ans ? x[i][b - 1] : ans);           }         }         cout << ans <<   n ;       }     }   }   signed main() {     ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);     ;     long long t = 1;     while (t--) {       sol();       cout.flush();     }     return 0;   }   