Compilare: user.cpp: In function ‘void Try(double)’: user.cpp:45:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr = 0; ^ user.cpp: In function ‘int main()’: user.cpp:65:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("mst.in", "r", stdin); ^ user.cpp:66:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("mst.out", "w", stdout); ^ user.cpp:68:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:70:126: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d %d %d", &edge[i].x, &edge[i].y, &edge[i].eq.a, &edge[i].eq.b, &edge[i].eq.c), edge[i].x ++, edge[i].y ++; ^