Compilare: user.cpp: In function ‘int main()’: user.cpp:16:24: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] a[k][p]=NULL; ^ user.cpp:25:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(b[a[i][x-1]]<b[a[i][0]]+1){ ^ user.cpp:25:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(b[a[i][x-1]]<b[a[i][0]]+1){ ^ user.cpp:26:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[a[i][x-1]]=b[a[i][0]]+1; ^ user.cpp:26:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[a[i][x-1]]=b[a[i][0]]+1; ^ user.cpp:27:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] t[i]=c[a[i][0]]; ^ user.cpp:28:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[a[i][x-1]]=i; ^ user.cpp:31:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(b[ch]>maxi){ ^ user.cpp:32:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] maxi=b[ch]; ^ user.cpp:33:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] poz=c[ch];} ^