Wrong Answer
/in/foo.cc: In function 'int main()':
/in/foo.cc:99:28: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
int answer = dp(sx, sy, 0);
^
/in/foo.cc:99:28: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]
