src.cpp: In function 'int GAPGIAY(int, int)':
src.cpp:10:43: error: 'ocsen' was not declared in this scope
if(a[x-1][y]==0 && x-1>=1) ocsen(x-1,y);
^
src.cpp:11:43: error: 'ocsen' was not declared in this scope
if(a[x+1][y]==0 && x+1<=n) ocsen(x+1,y);
^
src.cpp:12:43: error: 'ocsen' was not declared in this scope
if(a[x][y-1]==0 && y-1>=1) ocsen(x,y-1);
^
src.cpp:13:43: error: 'ocsen' was not declared in this scope
if(a[x][y+1]==0 && y+1<=m) ocsen(x,y+1);
^