1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
| #include <cstdio>
using namespace std;
using LL = long long;
const int N = 1000001;
int n, q, x, y, z;
LL c[N];
int lowbit(int x) {
return x & -x;
}
void add(int i, int k) {
for (; i <= n; i += lowbit(i))
c[i] += k;
}
LL getSum(int i) {
LL s = 0;
for (; i > 0; i -= lowbit(i))
s += c[i];
return s;
}
int main() {
scanf("%d%d", &n, &q);
for (int i = 1; i <= n; ++i) {
scanf("%d", &y);
c[i] += y - x;
int j = i + lowbit(i);
if (j <= n)
c[j] += c[i];
x = y;
}
for (int i = 0; i < q; ++i) {
scanf("%d", &x);
if (x == 1) {
scanf("%d%d%d", &x, &y, &z);
add(x, z);
add(y + 1, -z);
} else {
scanf("%d", &x);
printf("%lld\n", getSum(x));
}
}
return 0;
}
|