func_code_string: #include <bits/stdc++.h>   using namespace std;   long long a[100005], ac[100005];   int last[100005];   int main() {     int n, m, t, x, v, y, q;     string s;     while (cin >> n >> m) {       for (int i = 1; i <= n; i++) cin >> a[i];       for (int i = 1; i <= m; i++) {         cin >> t;         if (t == 1) {           cin >> v >> x;           a[v] = x;           last[v] = i;           ac[i] = ac[i - 1];         } else {           if (t == 2) {             cin >> y;             ac[i] = ac[i - 1] + y;           } else {             cin >> q;             cout << a[q] + ac[i - 1] - ac[last[q]] << endl;             ac[i] = ac[i - 1];           }         }       }     }   }   