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 = 0;
if (low + 1 == heigh)
{
if (coin[low] < coin[heigh])
{
re = low + 1;
return re;
}
else
{
re = heigh + 1;
return re;
}
}
if ((heigh - low + 1) % 2 == 0) //n是偶数
{
for (i = low; i < low+(heigh - low) / 2; i++)
{
sum1 = sum1 + coin[i];
}
for (i = low + (heigh - low) / 2 + 1; i < heigh; i++)
{
sum2 = sum2 + coin[i];
}
if (sum1 > sum2)
{
re = FalseCoin(coin, low + (heigh - low) / 2 + 1, heigh);
return re;
}
else
{
}
}
else
{
for (i = low; i < low+(heigh - low) / 2 - 1; i++)
{
sum1 = sum1 + coin[i];
}
for (i = low + (heigh - low) / 2 + 1; i < heigh; i++)
{
sum2 = sum2 + coin[i];
}
sum3 = coin[low + (heigh - low) / 2];
if (sum1 > sum2)
{
re = FalseCoin(coin, low + (heigh - low) / 2 + 1, heigh);
return re;
}
else if (sum1 < sum2)
{
re = FalseCoin(coin, low, low + (heigh - low) / 2 - 1);
return re;
}
else
{
}
if (sum1 + sum3 == sum2 + sum3)
{
re = low + (heigh - low) / 2 + 1;
return re;
}
}
}

int main()
{
int coin[MAXNUM];
int i, n;
int weizhi;
scanf("%d",&n);
for (i = 0; i < n; i++)
{
scanf("%d",coin[i]);
}
weizhi = FalseCoin(coin, 0, n - 1);
printf("在上述%d个银币中，第 %d 个银币是假的！
",n,weizhi);
system("pause");
return 0;
}