在vs2022编译器上进行了测试，过了 但是过不了洛谷的测评，求助

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<math.h>
typedef double ele;
struct point {
	ele x; ele y;
};
int dis(struct point a, struct point b) {
	return sqrt(      (a.x - b.x)* (a.x - b.x) + (a.y - b.y)*(a.y - b.y)       );
}
int main() {
	struct point inp[3];
	int r;
	for (r = 0; r < 3; r++) {
		scanf("%lf %lf", &inp[r].x, &inp[r].y);
	}
	ele ans = 0;
	for (r = 0; r < 2; r++) {
		ans += dis(inp[r], inp[r + 1]);
	}
	ans += dis(inp[2], inp[0]);
	printf("%.2lf", ans);
}