代码

#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 10;
#define int long long
// 线段树模板
struct NODE
{
    int l, r, val, lz; // lz为懒标记
} tree[4 * N];
int a[N];
void build(int p, int l, int r)
{
    tree[p].l = l;
    tree[p].r = r;
    if (l == r)
    {
        tree[p].val = a[l];
        return;
    }
    int mid = (l + r) >> 1;
    build(p * 2, l, mid);
    build(p * 2 + 1, mid + 1, r);
    tree[p].val = tree[p * 2].val + tree[p * 2 + 1].val;
}
void lazy(int p, int v)
{
    int s = tree[p].l, t = tree[p].r;
    tree[p].val += (t - s + 1) * v;
    tree[p].lz += v;
}
void pushdown(int p)
{
    lazy(p * 2, tree[p].lz);
    lazy(p * 2 + 1, tree[p].lz);
    tree[p].lz = 0;
}
// 带懒标记的区间修改
// [l,r]为修改区间，p为当前节点编号，c为区间节点变化值，求和
void update(int l, int r, int c, int p)
{
    int s = tree[p].l, t = tree[p].r;
    if (l <= s && t <= r)
    {
        return lazy(p, c);
    }
    if (tree[p].lz && s != t)
    {
        pushdown(p);
    }
    int mid = (s + t) >> 1;
    if (l <= mid)
        update(l, r, c, p * 2);
    if (r > mid)
        update(l, r, c, p * 2 + 1);
    tree[p].val = tree[p * 2].val + tree[p * 2 + 1].val;
}
// 带懒标记的区间查询（区间求和）
// [l,r]为修改区间，p为当前节点编号
int query(int l, int r, int p)
{
    int s = tree[p].l, t = tree[p].r;
    if (l <= s && t <= r)
    {
        return tree[p].val;
    }
    if (tree[p].lz)
    {
        pushdown(p);
    }
    int mid = (s + t) >> 1;
    int ans = 0;
    if (l <= mid)
        ans += query(l, r, p * 2);
    if (r > mid)
        ans += query(l, r, p * 2 + 1);
    return ans;
}
signed main()
{
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    build(1, 1, n);
    while (m--)
    {
        int op, x, y, k;
        cin >> op;
        if (op == 1)
        {

            cin >> x >> y >> k;
            update(x, y, k, 1);
        }
        else
        {
            cin >> x >> y;
            cout << query(x, y, 1) << endl;
        }
    }
    return 0;
}