poj1922

简单数学题

#include<cstdio>#include<cmath>#include<algorithm>#include<cstring>using namespace std;int n;int main(){    while(scanf("%d",&n)!=EOF)    {        if(n==0)            break;        int ans=0x3f3f3f3f;        for(int i=0;i<n;i++)        {            int x,y;            scanf("%d%d",&x,&y);            if(y<0)                continue;            ans=min(ans,(int)ceil((4.5*3600/x)+y));        }        printf("%d\n",ans);    }    return 0;}