func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 2e5 + 10;   const int mod = 1e9 + 7;   int n, q;   long long a[N], w[N], c[N << 1][2];   inline void add(int x, long long v, int id) {     if (!id)       for (; x <= n; x += x & -x) c[x][id] += v;     else       for (; x <= n; x += x & -x) c[x][id] = (c[x][id] + v + mod) % mod;   }   inline long long ask(int x, int id) {     long long ret = 0;     if (!id)       for (; x; x -= x & -x) ret += c[x][id];     else       for (; x; x -= x & -x) ret = (ret + c[x][id] + mod) % mod;     return ret;   }   inline long long gets(int x, int y, int id) {     if (!id)       return y >= x ? ask(y, id) - ask(x - 1, id) : 0;     else       return (ask(y, id) - ask(x - 1, id) + mod) % mod;   }   inline int bsearch(int x, int y) {     int l = x, r = y, mid;     while (l < r) {       mid = (l + r) / 2;       if (gets(x, mid, 0) >= gets(mid + 1, y, 0))         r = mid;       else         l = mid + 1;     }     return r;   }   int main() {     scanf( %d%d , &n, &q);     for (register int i = 1; i <= n; i++) scanf( %lld , &a[i]);     for (register int i = 1; i <= n; i++)       scanf( %lld , &w[i]), add(i, w[i], 0), add(i, w[i] * (a[i] - i), 1);     while (q--) {       int x, y;       scanf( %d%d , &x, &y);       if (x < 0) {         x = -x;         add(x, -w[x], 0);         add(x, -w[x] * (a[x] - x), 1);         w[x] = y;         add(x, w[x], 0);         add(x, w[x] * (a[x] - x), 1);       } else {         if (x == y) {           puts( 0 );           continue;         }         long long pos = bsearch(x, y), ans = 0;         ans = (ans + (gets(x, pos, 0) % mod) * (int)abs(a[pos] - pos) % mod -                gets(x, pos, 1) + mod) %               mod;         ans = (ans - (gets(pos, y, 0) % mod) * (int)abs(a[pos] - pos) % mod +                gets(pos, y, 1) + mod) %               mod;         printf( %lld n , ans);       }     }     return 0;   }   