Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:37:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lst[x].size(); ++i) ^ user.cpp:38:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < lst[x].size(); ++j) ^ user.cpp:71:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int cnf = 0; cnf < msk[sz1].size(); ++cnf) { ^ user.cpp:82:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] whg[axs[pr.first]] = -1; ^ user.cpp:85:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (whg[axs[pr.first]] == -1) ^ user.cpp:86:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] whg[axs[pr.first]] = ++ps; ^ user.cpp:88:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] arr = arr * 10 + whg[axs[pr.first]]; ^ user.cpp:104:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] whg[axs[pr.second]] = -1; ^ user.cpp:107:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (whg[axs[pr.second]] == -1) ^ user.cpp:108:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] whg[axs[pr.second]] = ++ps; ^ user.cpp:110:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] arr = arr * 10 + whg[axs[pr.second]]; ^