Compilare: user.cpp: In function ‘void RootTree()’: user.cpp:42:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < vec[i].size(); k++) { ^ user.cpp: In function ‘void MergeSons()’: user.cpp:88:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] fson[ch] = 0; ^ user.cpp:90:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < sons[q[i]].size(); k++) { ^ user.cpp:92:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (fson[c[j]] == 0) ^ user.cpp:93:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] fson[c[j]] = j; ^ user.cpp:95:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (p = 0; p < sons[j].size(); p++) { ^ user.cpp:97:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] sons[fson[c[j]]].push_back(r); ^ user.cpp:106:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (fson[ch] > 0) { ^ user.cpp:107:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] sson[q[i]] = fson[ch]; ^ user.cpp:108:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] pp[fson[ch]] = q[i]; ^ user.cpp:79:24: warning: unused variable ‘L’ [-Wunused-variable] int i, j, k, p, r, L, li, ls, mid; ^ user.cpp: In function ‘void SelectBest()’: user.cpp:179:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, curr = 0, prev = 0; ^