[SGU-151](http://mirror.codeforces.com/problemsets/acmsguru/problem/99999/151)↵
↵
Exactly the same code, GNU C++11 got WA on test #19 [submission:75830647], GNU C++14 got AC [submission:75830595].↵
I submitted 30 times to find the problem.↵
↵
~~~~~↵
#include <cstdio>↵
#include <cmath>↵
static const double EPS = 1e-13;↵
int main() {↵
double c, b, m; scanf("%lf%lf%lf", &c, &b, &m);↵
double c2 = c * c, b2 = b * b, m2 = m * m;↵
double a2 = 2 * (b2 + c2) - 4 * m2;↵
if (a2 < 0) {↵
printf("Mission impossible");↵
return 0;↵
}↵
double a = sqrt(a2);↵
if ((a + b < c) || (a + c < b) || (b + c < a)) {↵
printf("Mission impossible");↵
return 0;↵
}↵
double x = (c2 - b2) / (2 * a);↵
if (fabs(a) < EPS) x = 0;↵
double y = sqrt(m2 - x * x);↵
printf("%.5lf %.5lf\n",x,y);↵
printf("%.5lf %.5lf\n",-(a)/(double)2.0,(double)0);↵
printf("%.5lf %.5lf",(a)/(double)2.0,(double)0);↵
return 0;↵
}↵
~~~~~↵
↵
I hope the Codeforces maintainers verify the test data and [my report of SGU-124](http://mirror.codeforces.com/blog/entry/74508)
↵
Exactly the same code, GNU C++11 got WA on test #19 [submission:75830647], GNU C++14 got AC [submission:75830595].↵
I submitted 30 times to find the problem.↵
↵
~~~~~↵
#include <cstdio>↵
#include <cmath>↵
static const double EPS = 1e-13;↵
int main() {↵
double c, b, m; scanf("%lf%lf%lf", &c, &b, &m);↵
double c2 = c * c, b2 = b * b, m2 = m * m;↵
double a2 = 2 * (b2 + c2) - 4 * m2;↵
if (a2 < 0) {↵
printf("Mission impossible");↵
return 0;↵
}↵
double a = sqrt(a2);↵
if ((a + b < c) || (a + c < b) || (b + c < a)) {↵
printf("Mission impossible");↵
return 0;↵
}↵
double x = (c2 - b2) / (2 * a);↵
if (fabs(a) < EPS) x = 0;↵
double y = sqrt(m2 - x * x);↵
printf("%.5lf %.5lf\n",x,y);↵
printf("%.5lf %.5lf\n",-(a)/(double)2.0,(double)0);↵
printf("%.5lf %.5lf",(a)/(double)2.0,(double)0);↵
return 0;↵
}↵
~~~~~↵
↵
I hope the Codeforces maintainers verify the test data and [my report of SGU-124](http://mirror.codeforces.com/blog/entry/74508)
