package csp;
import java.util.*;
public class csp_20_12_01 {
public static void main(String[] args){
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int result = 0;
for(int i =0;i<n;i++){
int score = in.nextInt();
int w = in.nextInt();
result += score*w;
}//for
if(result>0){
System.out.print(result);
}else{
System.out.print("0");
}
}//main
}
20-12-01(期末预测之安全指数)
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转载自blog.csdn.net/qq_51985653/article/details/121109336
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