/in/foo.cc: In function 'int main()':
/in/foo.cc:10:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<a.size();i++){
              ~^~~~~~~~~
/in/foo.cc:11:12: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(x[a[i]]==0 && y[b[i]]==0){
            ^
/in/foo.cc:11:26: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(x[a[i]]==0 && y[b[i]]==0){
                          ^
/in/foo.cc:12:10: warning: array subscript has type 'char' [-Wchar-subscripts]
    x[a[i]]=b[i];
          ^
/in/foo.cc:13:10: warning: array subscript has type 'char' [-Wchar-subscripts]
    y[b[i]]=a[i];
          ^
/in/foo.cc:16:13: warning: array subscript has type 'char' [-Wchar-subscripts]
    if(x[a[i]]!=b[i] || y[b[i]]!=a[i]){
             ^
/in/foo.cc:16:30: warning: array subscript has type 'char' [-Wchar-subscripts]
    if(x[a[i]]!=b[i] || y[b[i]]!=a[i]){
                              ^
/in/foo.cc:24:9: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(x[i]==0 || y[i]==0){
         ^
/in/foo.cc:24:20: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(x[i]==0 || y[i]==0){
                    ^
/in/foo.cc:30:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<c.size();i++){
              ~^~~~~~~~~
/in/foo.cc:31:14: warning: array subscript has type 'char' [-Wchar-subscripts]
   Ans+=x[c[i]];
              ^