func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 100010;   int n, q, L[maxn << 2], R[maxn << 2];   double sum[maxn << 2], add[maxn << 2], mul[maxn << 2];   void pushup(int o) { sum[o] = sum[o * 2] + sum[o * 2 + 1]; }   void pushdown(int o) {     sum[o * 2] = sum[o * 2] * mul[o] + add[o] * (R[o * 2] - L[o * 2] + 1);     sum[o * 2 + 1] =         sum[o * 2 + 1] * mul[o] + add[o] * (R[o * 2 + 1] - L[o * 2 + 1] + 1);     add[o * 2] = add[o * 2] * mul[o] + add[o];     add[o * 2 + 1] = add[o * 2 + 1] * mul[o] + add[o];     mul[o * 2] = mul[o * 2] * mul[o];     mul[o * 2 + 1] = mul[o * 2 + 1] * mul[o];     mul[o] = 1;     add[o] = 0;   }   void build(int o, int l, int r) {     L[o] = l;     R[o] = r;     add[o] = 0;     mul[o] = 1;     if (l == r) {       cin >> sum[o];       return;     }     int mid = (l + r) >> 1;     build(o * 2, l, mid);     build(o * 2 + 1, mid + 1, r);     pushup(o);   }   double query(int o, int l, int r, int x, int y) {     if (x <= l && r <= y) {       return sum[o];     }     pushdown(o);     int mid = (l + r) >> 1;     double res = 0.0;     if (x <= mid) res += query(o * 2, l, mid, x, y);     if (y > mid) res += query(o * 2 + 1, mid + 1, r, x, y);     return res;   }   void update1(int o, int l, int r, int x, int y, double v) {     if (x <= l && r <= y) {       sum[o] += v * (r - l + 1);       add[o] += v;       return;     }     pushdown(o);     int mid = (l + r) >> 1;     if (x <= mid) update1(o * 2, l, mid, x, y, v);     if (y > mid) update1(o * 2 + 1, mid + 1, r, x, y, v);     pushup(o);   }   void update2(int o, int l, int r, int x, int y, double v) {     if (x <= l && r <= y) {       add[o] *= v;       sum[o] *= v;       mul[o] *= v;       return;     }     pushdown(o);     int mid = (l + r) >> 1;     if (x <= mid) update2(o * 2, l, mid, x, y, v);     if (y > mid) update2(o * 2 + 1, mid + 1, r, x, y, v);     pushup(o);   }   int main() {     scanf( %d%d , &n, &q);     build(1, 1, n);     while (q--) {       int l1, r1, l2, r2;       int id;       scanf( %d , &id);       if (id == 1) {         scanf( %d%d%d%d , &l1, &r1, &l2, &r2);         double sum1 = query(1, 1, n, l1, r1), sum2 = query(1, 1, n, l2, r2);         double len1 = r1 - l1 + 1, len2 = r2 - l2 + 1;         update2(1, 1, n, l1, r1, (len1 - 1) / len1);         update2(1, 1, n, l2, r2, (len2 - 1) / len2);         update1(1, 1, n, l1, r1, 1.0 / len1 * (sum2 / len2));         update1(1, 1, n, l2, r2, 1.0 / len2 * (sum1 / len1));       } else {         scanf( %d%d , &l1, &r1);         printf( %.7lf n , query(1, 1, n, l1, r1));       }     }     return 0;   }   