View Compilation Error

0_0_37714605_7266.cpp: In function 'bool check(int, int, int)':
0_0_37714605_7266.cpp:115:21: error: 'dx' was not declared in this scope
  if(f[x][y][idx]||x+dx[idx]<0||x+dx[idx]>=n||y+dy[idx]>=m||y+dy[idx]<0){
                     ^
0_0_37714605_7266.cpp:115:48: error: 'dy' was not declared in this scope
  if(f[x][y][idx]||x+dx[idx]<0||x+dx[idx]>=n||y+dy[idx]>=m||y+dy[idx]<0){
                                                ^
0_0_37714605_7266.cpp: In function 'bool solve(int)':
0_0_37714605_7266.cpp:154:31: error: 'dx' was not declared in this scope
    if(check(fx,fy,i)&&!vis[fx+dx[i]][fy+dy[i]]){
                               ^
0_0_37714605_7266.cpp:154:41: error: 'dy' was not declared in this scope
    if(check(fx,fy,i)&&!vis[fx+dx[i]][fy+dy[i]]){
                                         ^