Compilare: main.cpp: In function 'std::vector<long long int> solve(long long int, long long int)': main.cpp:35:8: warning: variable 'f' set but not used [-Wunused-but-set-variable] bool f = 0; ^ main.cpp: In function 'int main()': main.cpp:53:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dep.in", "r", stdin); ^ main.cpp:54:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dep.out", "w", stdout); ^ main.cpp:56:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld", &n, &m, &x); ^ main.cpp:59:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &u, &v); ^