Compilare: user.cpp: In function ‘int main()’: user.cpp:23:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] M[s[i]]++; ^ user.cpp:22:7: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(i=0; i< n;i++) ^~~ user.cpp:24:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ mx = 0; ^~