25 lines
497 B
C++
25 lines
497 B
C++
// Static Range Sum Queries
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#include<bits/stdc++.h>
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using namespace std;
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using ll = long long;
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int main() {
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int n, q; cin >> n >> q;
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vector<ll> pref(n, 0);
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ll x; cin >> x;
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pref[0] = x;
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for (int i = 1; i < n; i ++) {
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ll y; cin >> y;
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pref[i] = y + pref[i-1];
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}
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for (int i{}; i < q; i++) {
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int a, b; cin >> a >> b;
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if (a >= 2 ) cout << pref[b - 1] - pref[a - 2] << endl;
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else cout << pref[b - 1] << endl;
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}
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return 0;
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}
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