Compilare: user.cpp: In function ‘void Greedy()’: user.cpp:31:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( j=0; j<a[i].size() && c[a[i][j]]>-1; ++j) ; ^ user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j<a[i].size()) ^ user.cpp: In function ‘int dfs(int)’: user.cpp:45:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<a[i].size(); ++j) ^ user.cpp: In function ‘void R()’: user.cpp:11:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.in","r",stdin); ^ user.cpp:12:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&na,&nb,&m); ^ user.cpp:16:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^ user.cpp: In function ‘void Afiseaza()’: user.cpp:70:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.out","w",stdout); ^