[$\small\color{pink}\text{强行安利}$](https://www.luogu.org/blog/AuAqwqnoLGBlog/solution-p3372 "蟹蟹大佬的支持qwq蒟蒻AuAqwq十分感谢qwq")
by Null_Cat @ 2019-08-03 00:58:29
@[LJY_ljy](/space/show?uid=84987)
by Null_Cat @ 2019-08-03 00:59:17
```
#include <iostream>
#include <cstdio>
using namespace std;
const int maxn = 100010;
const long long inf = 10000000;
long long a[maxn];
long long minv[4 * maxn], lazy[4 * maxn];
void pushup(int id) {
minv[id] = minv[id << 1]+minv[id << 1 | 1];
}
void pushdown(int id,int l,int r) {
if (lazy[id]) {
lazy[id << 1] += lazy[id];
lazy[id << 1 | 1] += lazy[id];
int mid=(l+r)>>1;
minv[id << 1] += lazy[id]*(mid-l+1);
minv[id << 1 | 1] += lazy[id]*(r-mid);
lazy[id] = 0;
}
}
void build(int id, int l, int r) {
if (l == r) {
minv[id] = a[l];
return;
}
int mid = (l + r) >> 1;
build(id << 1, l, mid);
build(id << 1 | 1, mid + 1, r);
pushup(id);
}
void update(int id, int l, int r, long long x, long long y, long long v) {
if (x <= l && r <= y) {
lazy[id] += v;
minv[id] += v*(r-l+1);
return;
}
pushdown(id,l,r);
int mid = (l + r) >> 1;
if (x <= mid)
update(id << 1, l, mid, x, y, v);
if (y > mid)
update(id << 1 | 1, mid + 1, r, x, y, v);
pushup(id);
}
long long query(int id, int l, int r, long long x, long long y) {
long long res = 0;
if (x <= l && r <= y) {
return minv[id];
}
pushdown(id,l,r);
int mid = (l + r) >> 1;
if (x <= mid)
res += query(id << 1, l, mid, x, y);
if (y > mid)
res += query(id << 1 | 1, mid + 1, r, x, y);
return res;
}
int main() {
int n, m;
scanf("%d %d", &n, &m);
for (int i = 1; i <= n; i++)
scanf("%d", &a[i]);
build(1, 1, n);
for (int i = 1; i <= m; i++) {
int op;
scanf("%d", &op);
if (op == 1) {
long long x, y, v;
scanf("%lld %lld %lld", &x, &y, &v);
update(1, 1, n, x, y, v);
} else {
long long x, y;
scanf("%lld %lld", &x, &y);
printf("%lld\n", query(1, 1, n, x, y));
}
}
return 0;
}
```
by Porsche @ 2019-08-03 06:08:16
已改正
改动了pushup，注意审题，让求的是区间和，而不是区间最小值。
pushdown，下传懒标记的时候注意要乘上区间长度。
update，修改时也要注意区间长度。
by Porsche @ 2019-08-03 06:10:45
@[AuAqwq](/space/show?uid=213346) Thanks~
by LJY_ljy @ 2019-08-03 15:42:53
@[Porsche](/space/show?uid=93488)
谢谢您的改正
by LJY_ljy @ 2019-08-03 15:43:14
@[LJY_ljy](/space/show?uid=84987) 喵喵喵～
by Porsche @ 2019-08-03 15:48:03