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OI-codes/Luogu/P3368/P3368.cpp

61 lines
862 B
C++

#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 5e5 + 5;
int n, m, c[N];
int lowbit(int x) {
return x & -x;
}
void add(int x, int y) {
for (; x <= n; x += lowbit(x)) c[x] += y;
}
int sum(int x) {
int res = 0;
for (; x; x -= lowbit(x)) res += c[x];
return res;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 1, x; i <= n; i++) {
cin >> x;
add(i, x);
add(i + 1, -x);
}
while (m--) {
int op;
cin >> op;
if (op == 1) {
int x, y, k;
cin >> x >> y >> k;
add(x, k);
add(y + 1, -k);
} else { // op == 2
int x;
cin >> x;
cout << sum(x) << endl;
}
}
return 0;
}