Compilare: user.cpp: In function ‘void solveTask3()’: user.cpp:250:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < edge.size(); i++) { ^ user.cpp:243:18: warning: variable ‘stop’ set but not used [-Wunused-but-set-variable] int i, a, b, stop; ^ user.cpp: In function ‘int main()’: user.cpp:265:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.in", "r", stdin); ^ user.cpp:266:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.out", "w", stdout); ^ user.cpp:271:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &type, &n, &k); ^ user.cpp:273:77: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf %lf %lf %lf", &A.x, &A.y, &B.x, &B.y, &C.x, &C.y); ^ user.cpp: In function ‘void solveTask2()’: user.cpp:236:33: warning: ‘cnt’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans += 1ll * cnt * (cnt - 1) / 2; ^