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