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#include <iostream> #include <vector> #include <algorithm> #include <set> #include <cmath> #include <map> #include <cstring> using namespace std; vector<long long> prefix_sum; long long query(int a, int b) { if(a == 0) { return prefix_sum[b]; } return prefix_sum[b] - prefix_sum[a - 1]; } int main() { int n, q; cin >> n >> q; vector<int> v(n); long long sum = 0; for(int i = 0; i < n; i++) { cin >> v[i]; sum += v[i]; prefix_sum.push_back(sum); } for(int i = 0; i < q; i++) { int a, b; cin >> a >> b; a--; b--; cout << query(a, b) << endl; } return 0; }
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