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| #include <iostream>
#include <cstdio>
#define maxn 100010
#define ll long long
using namespace std;
int n, m, a[maxn];
#define lc i << 1
#define rc i << 1 | 1
struct seg {
ll v, add;
} T[maxn * 4];
inline void maintain(int i) { T[i].v = T[lc].v + T[rc].v; }
void build(int i, int l, int r) {
if (l == r) return (void) (T[i].v = a[l]);
int m = l + r >> 1;
build(lc, l, m); build(rc, m + 1, r);
maintain(i);
}
inline void pushdown(int i, int l, int r) {
if (!T[i].add) return ; ll &add = T[i].add; int m = l + r >> 1;
T[lc].v += (m - l + 1) * add;
T[rc].v += (r - m) * add;
T[lc].add += add;
T[rc].add += add;
add = 0;
}
void update(int i, int l, int r, int L, int R, int v) {
if (l > R || r < L) return ;
if (L <= l && r <= R) {
T[i].v += (ll) (r - l + 1) * v;
T[i].add += v; return ;
} int m = l + r >> 1; pushdown(i, l, r);
update(lc, l, m, L, R, v); update(rc, m + 1, r, L, R, v);
maintain(i);
}
ll query(int i, int l, int r, int L, int R) {
if (l > R || r < L) return 0;
if (L <= l && r <= R) return T[i].v;
int m = l + r >> 1; pushdown(i, l, r);
return query(lc, l, m, L, R) + query(rc, m + 1, r, L, R);
}
inline void solve_1() {
int l, r, v; scanf("%d%d%d", &l, &r, &v);
update(1, 1, n, l, r, v);
}
inline void solve_2() {
int l, r; scanf("%d%d", &l, &r);
printf("%lld\n", query(1, 1, n, l, r));
}
int main() {
cin >> 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 opt; scanf("%d", &opt);
switch (opt) {
case 1 : solve_1(); break;
case 2 : solve_2(); break;
}
}
return 0;
}
|