HDU1239 Calling Extraterrestrial Intelligence Again (打表+暴力)
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这题首先可以进行素数的打表,一开始一直错,发现是自己的素数表大的有问题,打完表接下来就很简单的进行暴力就行了。
#include<stdio.h>#include<string.h>bool sushu[100005];void prime(){ memset(sushu,true,sizeof(sushu)); sushu[0]=sushu[1]=false; for(int i = 2;i*i < 100005;i++) if(sushu[i]){ for(int j=i*i;j<100005;j+=i){ sushu[j]=false; } }}int main(){ int m,a,b; prime(); while(scanf("%d %d %d",&m,&a,&b),m,a,b){ double t = a*1.0/b; int p = 1,q = 1; for(int i = 2;i<=m/2;i++){ if(sushu[i] == false) continue; for(int j = 2;j<=i && i*j <=m;j++){ if(j*1.0/i < t || sushu[j] == false) continue; if(i*j > p*q){ p = i; q = j; } } } printf("%d %d\n",q,p); } return 0;}
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