Main.cc: In function 'int main()':
Main.cc:528:5: error: 'arr' was not declared in this scope
a[arr[i]]++;
^
Main.cc:530:8: error: 'o' was not declared in this scope
int m=o;
^
Main.cc:533:9: warning: array subscript has type 'char' [-Wchar-subscripts]
if(a[c]>m){
^
Main.cc:534:9: warning: array subscript has type 'char' [-Wchar-subscripts]
m=a[c];
^