View Compilation Error

0_0_33279813_9354.cpp: In function 'int main()':
0_0_33279813_9354.cpp:50:18: error: too few arguments to function 'int BFS(int, int, int, int)'
   cout<<BFS(x0,y0)<<endl;
                  ^
0_0_33279813_9354.cpp:12:5: note: declared here
 int BFS(int x0,int y0,int n,int m){
     ^