Compilare: main.cpp: In function 'int pc(std::vector<std::pair<int, int> >, int)': main.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].adj.size(); i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < valoare.size(); k++) ~~^~~~~~~~~~~~~~~~ main.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].adj.size(); i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < valoare.size(); k++) ~~^~~~~~~~~~~~~~~~ main.cpp:49:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'void BFS(int)': main.cpp:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[nod].adj.size(); i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fof.in", "r", stdin); ^ main.cpp:87:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fof.out", "w", stdout); ^ main.cpp:89:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ main.cpp:93:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^