Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:77:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (maps[indmap[x]].size() > mx) ~~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:90:21: warning: unused variable 'val' [-Wunused-variable] int val = i.first; ^~~ main.cpp:91:21: warning: unused variable 'cntval' [-Wunused-variable] int cntval = i.second; ^~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:27:38: 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); ^ main.cpp: In function 'void dfs(int, int)': main.cpp:84:18: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized] indmap[node] = pos; ~~~~~~~~~~~~~^~~~~ main.cpp:108:15: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] ind[node] = ans; ~~~~~~~~~~^~~~~