View Compilation Error

0_0_37886782_424.cpp: In function 'void dfs(int, int, int, int)':
0_0_37886782_424.cpp:28:6: error: 'jint' was not declared in this scope
  for(jint i = 0;i < 4;i++)
      ^
0_0_37886782_424.cpp:28:17: error: 'i' was not declared in this scope
  for(jint i = 0;i < 4;i++)
                 ^
0_0_37886782_424.cpp: In function 'int main()':
0_0_37886782_424.cpp:51:4: error: return-statement with no value, in function returning 'int' [-fpermissive]
    return ;
    ^