Compilare: main.cpp: In function 'void choose(int)': main.cpp:104:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (num.first == 0) ^~ main.cpp:106:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' x = t[x].first; ^ main.cpp: In function 'int main()': main.cpp:189:18: warning: array subscript has type 'char' [-Wchar-subscripts] op[ch].push_back((Query){a, h[v], i}); ^ main.cpp:191:18: warning: array subscript has type 'char' [-Wchar-subscripts] op[ch].push_back((Query){b, h[v] - 1, i}); ^ main.cpp:193:18: warning: array subscript has type 'char' [-Wchar-subscripts] op[ch].push_back((Query){b, h[v], i}); ^