hdu 4493 Tutor （水 精度）

题意：

思路：

 

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>using namespace std;
int fa[150];
int fin(int x)
{return fa[x]==x?x:fin(fa[x]);
}
void unionn(int x,int y)
{int fx=fin(x);int fy=fin(y);if(fx!=fy){fa[fy]=fx;}
}
int main()
{int n,m,t;int i,j,k;double a,sum,now,num[15];scanf("%d",&t);while(t--){sum=0;for(i=0;i<12;i++){scanf("%lf",&now);sum+=now;}sum/=12;sum*=1000;int ans=sum+5;ans/=10;double a;printf("$");if(ans%10!=0){a=ans*1.0;printf("%.2f\n",a/100);}else if(ans%100!=0){a=ans*1.0;printf("%.1f\n",a/100);}else{printf("%d\n",ans/100);}}return 0;
}