POJ 2017 Speed Limit G++

#include <iostream>#include <cstring>using namespace std;int main(){int jg[1000];memset(jg,0,sizeof(jg));int m=0;while(1){int n;cin>>n;if(n==-1){break;}int a[n];int b[n];memset(a,0,sizeof(a));memset(b,0,sizeof(b));for(int i=0;i<n;i++){cin>>a[i];cin>>b[i];}jg[m]=a[0]*b[0];for(int i=1;i<n;i++){jg[m]=jg[m]+a[i]*(b[i]-b[i-1]);}m++;}for(int i=0;i<m;i++){cout<<jg[i]<<" miles"<<endl;}return 0;}