/in/foo.cc: In function 'bool Find(int)':
/in/foo.cc:27:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
/in/foo.cc: In function 'void solve()':
/in/foo.cc:73:15: error: redeclaration of 'int i'
  int cnt = 0, i;
               ^
/in/foo.cc:44:6: note: 'int i' previously declared here
  int i, j;
      ^