杭电acm4520

第28行，原来用的是abs，WA。因为返回的是int类型的，所以总是0。自己写了个myabs函数。

#include <stdio.h>
#include <math.h>

float myabs(float a) {  
    return a>0?a:-a;  
}  

int main() {
	
	int n, i, ans;
	double max, min, sum, temp, t1, t2, d[21];
	while(~scanf("%d", &n) && n) {
		max = -1;
		min = 11;
		sum = 0;
		for(i=0; i<n; i++) {
			scanf("%lf", &d[i]);
			if(d[i]>max)
				max = d[i];
			if(d[i]<min)
				min = d[i];
			sum += d[i];
		}
		sum -= (max + min);
		temp = sum / (n-2);
		t1 = 11.0;
		for(i=0; i<n; i++) {
			t2 = myabs(temp - d[i]);
			if(t1>t2) {
				ans = i;
				t1 = t2;
			}
				 
		}
		
		
		printf("%d\n", ans+1);
	}
	
	return 0;
}