Compilare: user.cpp: In function ‘int exista(double, double)’: user.cpp:39:14: warning: statement has no effect [-Wunused-value] for (step; step; step >>= 1) { ^ user.cpp:44:14: warning: statement has no effect [-Wunused-value] for (step; step; step >>= 1) { ^ user.cpp: In function ‘void solve()’: user.cpp:61:20: warning: unused variable ‘D’ [-Wunused-variable] double D = sqrt((q.y-p.y)*(q.y-p.y) + (q.x-p.x)*(q.x-p.x)); ^ user.cpp:62:20: warning: unused variable ‘msl’ [-Wunused-variable] double msl = (q.x - p.x) / (q.y-p.y); ^ user.cpp: In function ‘void citire()’: user.cpp:29:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:31:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf\n", &a[i].x, &a[i].y); ^ user.cpp: In function ‘int main()’: user.cpp:78:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triang.in", "r", stdin); ^ user.cpp:79:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triang.out", "w", stdout); ^