Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:24:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < e[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:50:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < e[1].size(); i++) { ^ user.cpp:59:22: warning: unused variable ‘ci’ [-Wunused-variable] bool ci = false, cj = false, ck = false; ^ user.cpp:59:34: warning: unused variable ‘cj’ [-Wunused-variable] bool ci = false, cj = false, ck = false; ^ user.cpp:59:46: warning: unused variable ‘ck’ [-Wunused-variable] bool ci = false, cj = false, ck = false; ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("petrica.in", "r", stdin); ^ user.cpp:34:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("petrica.out", "w", stdout); ^