23 lines
305 B
C++
23 lines
305 B
C++
#include<cstdio>
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#include<cmath>
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int main()
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{
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int n,tz,v,t,s=4.5*3600;
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while(scanf("%d",&n))
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{
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if(!n) return 0;
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int mint=10000;
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for(int i=1;i<=n;i++)
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{
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scanf("%d%d",&v,&t);
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if(t>=0)
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{
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tz=ceil((double)s/v)+t;
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if(tz<mint) mint=tz;
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}
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}
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printf("%d\n",mint);
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}
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return 0;
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}
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