Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nod[x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:98:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nod[x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void eulerTour()': main.cpp:104:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<l.size(); i++) maxip[i] = max(maxip[i-1], a[l[i]]); ~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:127:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(la[x] < l.size() - 1) ans = max(ans, maxis[la[x]+1]); ~~~~~~^~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:20:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^