0_0_2078771_31870.cpp: In function `void dfs(int, int, int)':
0_0_2078771_31870.cpp:19: error: `max' undeclared (first use this function)
0_0_2078771_31870.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2078771_31870.cpp: At global scope:
0_0_2078771_31870.cpp:28: error: `main' must return `int'
0_0_2078771_31870.cpp: In function `int main(...)':
0_0_2078771_31870.cpp:36: error: `max' undeclared (first use this function)
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