Codeforces Testing Round #14 (Unrated) B
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用dp做的,当时没有细想,大概会有更简单的办法的。
#include <iostream>#define min(_x,_y) ((_x<_y)?(_x):(_y))using namespace std;bool ok[10][10]={false};int need[10][10]={0};int main(){ int length,r_l,up,i,j,k,l; cin>>length>>r_l>>up; for(i=0;i<=4;i++){for(j=0;j<=2;j++){ if(i*r_l+j*up<=length)ok[i][j]=true; need[i][j]=100; }} need[0][0]=0;ok[0][0]=false; for(i=0;i<=4;i++){for(j=0;j<=2;j++){ for(k=i;k>=0;k--){ for(l=j;l>=0;l--){ if(i-k>=0&&j-l>=0&&ok[k][l])need[i][j]=min(need[i][j],1+need[i-k][j-l]); } } }} printf("%d",need[4][2]);}
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