0_0_20511501_9220.cpp: In function 'void doit()':
0_0_20511501_9220.cpp:53:11: error: too few arguments to function 'void dfs(int, int, int)'
dfs(-1, 0);
^
0_0_20511501_9220.cpp:23:6: note: declared here
void dfs(int last_x, int last_y, int times) {
^
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