poj 2709 Painter 坑爹贪心
2016-11-17 16:50
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贪心策略选择:
每次减的越少,每种颜料的利用率就越高,因为必须三种颜色的颜料同时有Xml时才能配色,只有一种或者两种颜料大于0时不能配色,如果这一种或者两种颜色的体积比较大时,明显就浪费了,所以贪心策略每次将体积最大的三种颜料体积减1
每次减的越少,每种颜料的利用率就越高,因为必须三种颜色的颜料同时有Xml时才能配色,只有一种或者两种颜料大于0时不能配色,如果这一种或者两种颜色的体积比较大时,明显就浪费了,所以贪心策略每次将体积最大的三种颜料体积减1
#include<iostream> #include<cstring> #include<string> #include<algorithm> #include<functional> using namespace std; #define maxn 256 int N,G; int a[20]; int min(int a,int b) { return a<b?a:b; } int main() { int i,j,k,ans; int tmp; while(scanf("%d",&N),N) { for(i=0;i<N;i++) scanf("%d",a+i); scanf("%d",&G); sort(a,a+N,greater<int>()); ans=a[0]/50; if(a[0]%50) ans++; for(i=0;i<N;i++) a[i]=ans*50-a[i]; sort(a,a+N,greater<int>()); while(G) { while(G>0 && a[2]>0) { //tmp=min(G,a[2]); G--; a[0]--; a[1]--; a[2]--; sort(a,a+N,greater<int>()); } if(G>0) for(ans++,i=0;i<N;i++) a[i]+=50; } printf("%d\n",ans); } return 0; }
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