C++ 分治思想 真假银币

 #include "stdio.h"
 #include "iostream"
 #define MAXNUM 30

 int FalseCoin(int coin[], int low, int heigh)
 {
 int i, sum1, sum2, sum3;
 int re;

 sum1 = sum2 = sum3 = ;
 if (low +  == heigh)
 {
 if (coin[low] < coin[heigh])
 {
 re = low + ;
 return re;
 }
 else
 {
 re = heigh + ;
 return re;
 }
 }
 if ((heigh - low + ) %  == ) //n是偶数
 {
 for (i = low; i < low+(heigh - low) / ; i++)
 {
 sum1 = sum1 + coin[i];
 }
 for (i = low + (heigh - low) /  + ; i < heigh; i++)
 {
 sum2 = sum2 + coin[i];
 }
 if (sum1 > sum2)
 {
 re = FalseCoin(coin, low + (heigh - low) /  + , heigh);
 return re;
 }
 else
 {
 }
 }
 else
 {
 for (i = low; i < low+(heigh - low) /  - ; i++)
 {
 sum1 = sum1 + coin[i];
 }
 for (i = low + (heigh - low) /  + ; i < heigh; i++)
 {
 sum2 = sum2 + coin[i];
 }
 sum3 = coin[low + (heigh - low) / ];
 if (sum1 > sum2)
 {
 re = FalseCoin(coin, low + (heigh - low) /  + , heigh);
 return re;
 }
 else if (sum1 < sum2)
 {
 re = FalseCoin(coin, low, low + (heigh - low) /  - );
 return re;
 }
 else
 {
 }
 if (sum1 + sum3 == sum2 + sum3)
 {
 re = low + (heigh - low) /  + ;
 return re;
 }
 }
 }

 int main()
 {
 int coin[MAXNUM];
 int i, n;
 int weizhi;
 scanf("%d",&n);
 for (i = ; i < n; i++)
 {
 scanf("%d",coin[i]);
 }
 weizhi = FalseCoin(coin, , n - );
 printf("在上述%d个银币中，第 %d 个银币是假的！\n",n,weizhi);
 system("pause");
 return ;
 }