func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long mx = 1e5 + 10;   long long n, m, a[mx], cnt[mx], r[mx], l[mx], p[mx], ans[mx];   int main() {     cin >> n >> m;     for (long long i = 1; i <= n; i++) {       cin >> a[i];       if (a[i] < mx) cnt[a[i]]++;     }     for (long long i = 0; i < m; i++) cin >> l[i] >> r[i];     for (long long in = 1; in < mx; in++) {       if (cnt[in] >= in) {         p[0] = 0;         for (long long i = 1; i <= n; i++) p[i] = p[i - 1] + (a[i] == in);         for (long long i = 0; i < m; i++)           ans[i] += ((p[r[i]] - p[l[i] - 1]) == in);       }     }     for (long long i = 0; i < m; i++) cout << ans[i] << endl;     return 0;   }   