HDU 2277 Change the ball（找规律）

Change the ball

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 643    Accepted Submission(s): 231

Problem Description

Garfield has three piles of balls, each pile has unique color of following: yellow, blue, and red. Now we also know Garfield has Y yellow balls, B blue balls, and R red balls. But Garfield just wants to change all the balls to one color. When he puts two balls of different color togather, the balls then change their colors automatically into the rest color. For instance, when Garfield puts a red one and a yellow one togather, the two balls immediately owns blue color, the same to other situations. But the rule doesn’t work when the two balls have the same color.
  Garfield is not able to estimate the minimal steps to achieve the aim. Can you tell him?

 

Input

For each line, there are three intergers Y, B, R(1<=Y,B,R<=1000),indicate the number refered above.

 

Output

For each case, tell Garfield the minimal steps to complete the assignment. If not, output the symbol “):”.

 

Sample Input

1 2 31 2 2

 

Sample Output

):2

 

Source

HDU 8th Programming Contest Site（1）

 

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题意：给出3种颜色小球的数目，两种不同颜色的小球能可以变为另一种颜色的小球，问能 否转化为一种小球，最少需要几步

分两种情况，第一种有两种小球的数目一样可以，第二种两种小球的数目之差为三的倍数

#include<stdio.h>#include<string.h>#include<algorithm>using namespace std;int main(){int a[4];while(scanf("%d%d%d",&a[1],&a[2],&a[3])!=EOF){sort(a+1,a+4);if(a[1]==a[2]||(a[2]-a[1])%3==0)printf("%d\n",a[2]);    else if(a[1]==a[3]||a[2]==a[3]||(a[3]-a[1])%3==0||(a[3]-a[2])%3==0)printf("%d\n",a[3]);elseprintf("):\n");}return 0;}