Compilare: main.cpp: In function 'void dfs(int)': main.cpp:31:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();++i) ~^~~~~~~~~~~~ main.cpp: In function 'void afis()': main.cpp:77:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<S[i].size();++j) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:9: warning: variable 'i' set but not used [-Wunused-but-set-variable] int i,j; ^ main.cpp:86:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp: In function 'void citire()': main.cpp:15:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.in","r",stdin); ^ main.cpp:16:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.out","w",stdout); ^ main.cpp:17:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:21:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^