View Compilation Error

0_0_25978487_29295.cpp: In function 'void dfs(int, int)':
0_0_25978487_29295.cpp:11:10: error: expected primary-expression before '||' token
   if(dx<=|||dy<0||dx>=M||dy>=N) continue;
          ^
0_0_25978487_29295.cpp:11:12: error: expected primary-expression before '|' token
   if(dx<=|||dy<0||dx>=M||dy>=N) continue;
            ^
0_0_25978487_29295.cpp:11:23: error: 'M' was not declared in this scope
   if(dx<=|||dy<0||dx>=M||dy>=N) continue;
                       ^
0_0_25978487_29295.cpp:11:30: error: 'N' was not declared in this scope
   if(dx<=|||dy<0||dx>=M||dy>=N) continue;
                              ^
0_0_25978487_29295.cpp: In function 'int main()':
0_0_25978487_29295.cpp:19:12: error: return-statement with no value, in function returning 'int' [-fpermissive]
   if(m==0) return;
            ^