Compilare: user.cpp: In function ‘void dfs(int, std::vector<int>*, int*)’: user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ user.cpp: In function ‘bool solve(int, int)’: user.cpp:103:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cnt==v2[m].size()) ~~~^~~~~~~~~~~~~~ user.cpp: In function ‘int getint()’: user.cpp:18:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^ user.cpp:23:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,maxb,1,fin),ptr=0; ^