0_0_1228420_1629.cpp: In function `void dfs(int, int, int)':
0_0_1228420_1629.cpp:21: error: `remain' undeclared (first use this function)
0_0_1228420_1629.cpp:21: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1228420_1629.cpp:23: error: expected `;' before "if"
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