求助

#include<bits/stdc++.h>
#define up(i) sum[i]=sum[(i)<<1]+sum[(i)<<1|1];
using namespace std;
int sum[(int)4e6 + 5];
int add[(int)4e6 + 5];
int a[(int)1e6 + 5];
void lazy(int v, int n, int i) {
    add[i] += n;
    sum[i] += v * n;
}
void down(int i, int ln, int rn) {
    if (add[i] != 0) {
        lazy(add[i], ln, i << 1);
        lazy(add[i], rn, i << 1 | 1);
        add[i] = 0;
    }
}
void add_(int jobl, int jobr, int jobv, int l, int r, int i) {
    if (jobl <= l && r <= jobr) {
        lazy(jobv, r - l + 1, i);
    } else {
        int mid = (l + r) >> 1;
        down(i, mid - l + 1, r - mid);
        if (jobl <= mid) {
            add_(jobl, jobr, jobv, l, mid, i << 1);
        }
        if (jobr > mid) {
            add_(jobl, jobr, jobv, mid + 1, r, i << 1 | 1);
        }
        up(i);
    }
}
void build(int l, int r, int i) {
    if (l == r) {
        sum[i] = a[l];
    } else {
        int mid = (l + r) >> 1;
        build(l, mid, i << 1), build(mid + 1, r, i << 1 | 1);
        up(i);
    }
    add[i] = 0;
    return;
}
long long query(int jobl, int jobr, int l, int r, int i) {
    if (jobl <= l && jobr >= r) {
        return sum[i];
    }
    long long ans = 0;
    int mid = (l + r) >> 1;
    down(i, mid - l + 1, r - mid);
    if (jobl <= mid) {
        ans += query(jobl, jobr, l, mid, i << 1);
    }
    if (jobr > mid) {
        ans += query(jobl, jobr, mid + 1, r, i << 1 | 1);
    }
    return ans;
}
int main() {
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        int x;
        cin >> x;
        a[i] = x;
    }
    build(1, n, 1);
    for (int i = 1; i <= m; i++) {
        int c;
        cin >> c;
        switch (c) {
            case 1:
                int x, y, k;
                cin >> x >> y >> k;
                add_(x, y, k, 1, n, 1);
                break;
            case 2:
                int aa, b;
                cin >> aa >> b;
                cout << query(aa, b, 1, n, 1) << endl;
                break;
            default:
                break;
        }
    }
}

全WA，求助qwq