//如題測試都過但是提交卻出現記憶體區段的問題

#include<iostream>

using namespace std;

int main()

{

int n, m, i, x, y,total;

int plus[1001] = { 0 }, sum[1000] = { 0 };

while (cin >> n >> m)

{

for (i = 0; i < n; i++)

{

cin >> plus[i];

sum[i + 1] += plus[i];

sum[i + 1] += sum[i];

}

for (i = 0; i < m; i++)

{

cin >> x >> y;

total = sum[y] - sum[x-1];

cout << total<<endl;

}

}

return 0;

}

陣列開太小，題目有說n和m小於等於100000