Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:36:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[node].size();i++) ^ user.cpp:37:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(g[node][i]!=father) ^ user.cpp: In function ‘bool Hamilton(int, int, int, int)’: user.cpp:61:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[node].size();i++) ^ user.cpp: In function ‘void SolveBiconex(int, int, int)’: user.cpp:70:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<component[index].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:109:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<solution.size();i++) ^ user.cpp:78:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("santa.in","r",stdin); ^ user.cpp:79:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("santa.out","w",stdout); ^ user.cpp:81:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:83:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:87:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&s,&e,&q); ^