Compilare: main.cpp: In function 'bool bfs(int, int)': main.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[u].size(); i++){ ~^~~~~~~~~~~~ main.cpp: In function 'int detflow(int)': main.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[n].size(); i++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("croco.in", "r", stdin); ^ main.cpp:58:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("croco.out", "w", stdout); ^ main.cpp:60:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:64:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:83:16: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(1, poz); ^