func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int a[100010];   long long ans = 0;   int main() {     scanf( %d%d , &n, &m);     for (int i = 1; i <= n; i++) scanf( %d , &a[i]);     for (int Q = 0; Q < 20; Q++) {       for (int j = 1; j <= n; j++)         if (a[j] & (1 << Q)) {           int k = 0;           for (k = j; k <= n && (a[k] & (1 << Q)); k++)             ;           k--;           ans += ((long long)(k - j + 1) * (k - j + 2) / 2) << Q;           j = k;         }     }     for (int P = 1; P <= m; P++) {       int p, v;       scanf( %d%d , &p, &v);       for (int Q = 0; Q < 20; Q++)         if ((a[p] & (1 << Q)) ^ (v & (1 << Q))) {           int l, r;           for (l = p - 1; l && (a[l] & (1 << Q)); l--)             ;           for (r = p + 1; r <= n && (a[r] & (1 << Q)); r++)             ;           l = p - l;           r -= p;           if ((v >> Q) & 1)             ans += ((long long)l * r) << Q;           else             ans -= ((long long)l * r) << Q;         }       a[p] = v;       printf( %I64d n , ans);     }     return 0;   }   