0_0_30334222_28838.cpp: In function 'int f(int, int, int, int)':
0_0_30334222_28838.cpp:15:22: error: 'dfs' was not declared in this scope
dfs(tx,ty,2,F);
^
0_0_30334222_28838.cpp:17:23: error: 'dfs' was not declared in this scope
dfs(tx,ty,3,F);
^
0_0_30334222_28838.cpp:21:23: error: 'dfs' was not declared in this scope
dfs(tx,ty,2,F);
^
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