Submission #1911008

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Source Code Expand

#include <stdio.h>

int compare_int(const void *a, const void *b){
	return *(int*)a - *(int*)b;
}

int main(void){
	double rate = 0;
	int n, k;
	scanf("%d",&n);
	scanf("%d",&k);
	
	int r[n];
	int i;
	for(i = 0; i < n; i++){
		scanf("%d",&r[i]);
	}
	
	qsort(r, n, sizeof(int), compare_int);
	
	int j;
	for(j = 0; j < k; j++){
		rate = (rate + r[n-k+j])/2;//小さいものから順に最大値まで見る
	}
	printf("%f\n",rate);
	
	return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:19:2: warning: implicit declaration of function ‘qsort’ [-Wimplicit-function-declaration]
  qsort(r, n, sizeof(int), compare_int);
  ^
./Main.c:10:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^
./Main.c:11:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&k);
  ^
./Main.c:16:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&r[i]);
   ^

Judge Result