Compilare: user.cpp: In function ‘int dfs(int, int)’: user.cpp:41:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp:46:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int Down_victory(int)’: user.cpp:51:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();++i) ^ user.cpp: In function ‘int Up_victory(int)’: user.cpp:62:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[father[nod]].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:93:13: warning: unused variable ‘c’ [-Wunused-variable] int c=0; ^ user.cpp: In function ‘char nextch()’: user.cpp:12:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^