代码
#include<bits/stdc++.h>
using namespace std;
int main(){
int n,sum=0;
cin >> n;
for(int i=0; i<n; i++) {
int a,b;
cin >> a >> b;
sum += (a*b);
}
cout << max(0,sum);
return 0;
}
样例输入1
6
2 60
10 100
0 70
0 0
-10 50
10 60
样例输出1
1220
样例输入2
2
-10 100
-1 15
样例输出2
0
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