/in/foo.cc: In function 'long long int count1(int, int, int)':
/in/foo.cc:13:23: warning: operation on 'mod[x]' may be undefined [-Wsequence-point]
   cnt=cnt-c[mod[x]]+c[++mod[x]];                 
                       ^~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:22:6: warning: unused variable 'L' [-Wunused-variable]
  int L,R;
      ^
/in/foo.cc:22:8: warning: unused variable 'R' [-Wunused-variable]
  int L,R;
        ^