21 lines
388 B
C++
21 lines
388 B
C++
#include <bits/stdc++.h>
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using namespace std;
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const int N = 100010;
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int s[N];
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// 一维前缀和
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int main() {
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int n, m;
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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int x;
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cin >> x;
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s[i] = s[i - 1] + x;
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}
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while (m--) {
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int l, r;
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cin >> l >> r;
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printf("%d\n", s[r] - s[l - 1]);
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}
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return 0;
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} |