Submission #1917284

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Source Code Expand

/*
AtCoder Regular Contest 004 A - 2点間距離の最大値 ( The longest distance )
Ver1
*/

/*
    1-2,1-3...
        2-3,2-4...
		    3-4,4-5...
	各(*−*)2+(*−*)2を算出
	最大値を確保
	√最大値　を　求める 
*/

int x[101];
int y[101];

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

//#define DEBUG1
//#define DEBUG2

int main() {

	int n;
	double l_max = 0;




	scanf("%d", &n);
/*入力
*/
	for (int i = 0; i < n; i++) {
		scanf("%d", &x[i]);
		scanf("%d", &y[i]);
	}
#ifdef DEBUG1
	printf("n = %d\n", n);
	for (int i = 0; i < n; i++) {
		printf("x[%d] = %d \t y[%d] = %d\n", i, x[i], i, y[i]);
	}
#endif
	/*最大値求める
	*/
	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++) {
			if (l_max < pow(x[j] - x[i], 2) + pow(y[j] - y[i], 2)) {
				l_max = pow(x[j] - x[i], 2) + pow(y[j] - y[i], 2);
#ifdef DEBUG1
				printf("l_max = %f\n", l_max);
#endif
			}
		}
	}
	/*最大距離に変換する
	*/
	l_max = sqrt(l_max);
#ifdef DEBUG1
	printf("l_max_ans = %f\n", l_max);
#endif
	printf("%f\n", l_max);

#ifdef DEBUG2
	getch();
#endif
	return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:32:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ^
./Main.c:36:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &x[i]);
   ^
./Main.c:37:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &y[i]);
   ^

Judge Result