题解 | #点的距离#

#include<stdio.h>
int main() {
    int m;
    scanf("%d", &m);
    int x1, y1, x2, y2;
    for (int i = 1; i <= m; i++) {
        scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
        double r = sqrt(  (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
        printf("%.2lf\n", r);

    }

    return 0;
}