Problem:
Score : 300 points

Problem Statement

You are given three integers A, B and C. Find the minimum number of operations required to make A, B and C all equal by repeatedly performing the following two kinds of operations in any order:

Choose two among A, B and C, then increase both by 1.

Choose one among A, B and C, then increase it by 2.

It can be proved that we can always make A, B and C all equal by repeatedly performing these operations.

Constraints

0 \leq A,B,C \leq 50

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B C

Output

Print the minimum number of operations required to make A, B and C all equal.

Sample Input 1

2 5 4

Sample Output 1

2

We can make A, B and C all equal by the following operations:

Increase A and C by 1. Now, A, B, C are 3, 5, 5, respectively.

Increase A by 2. Now, A, B, C are 5, 5, 5, respectively.

Sample Input 2

2 6 3

Sample Output 2

5

Sample Input 3

31 41 5

Sample Output 3

23

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
int main(void){
  int i,j;
  int a,b,c;
  int max=0,min=0,t=0;
  int d1,d2;
  int ans=0;
  scanf("%d %d %d",&a,&b,&c);
  if(a>b && a>c){
    max = a;
    if(b>c){
      t=b;
      min=c;
    }else{
      t=c;
      min=b;
    }
  }else if(b>a && b>c){
    max=b;
    if(a>c){
      t=a;
      min=c;
    }else{
      t=c;
      min=a;
    }
  }else if(c>a && c>b){
    max=c;
    if(a>b){
      t=a;
      min=b;
    }else{
      t=b;
      min=a;
    }
  } 
  d1=max-min;d2=max-t;
  if(d1%2==1 && d2%2==1){
    ans+=(d1-d2)/2;
    ans += d2;
  }else if(d1%2==0 && d2%2==0){
    ans += (d1-d2)/2;
    ans += d2;
  }else{
    ans += (d1-d2)/2;
    ans += d2+2;
  }
  printf("%d\n",ans);
  return 0;
}