0_0_2046237_31645.cpp: In function `void init()':
0_0_2046237_31645.cpp:6: error: `memset' undeclared (first use this function)
0_0_2046237_31645.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2046237_31645.cpp: In function `void iter_DFS(int, int)':
0_0_2046237_31645.cpp:13: error: `memset' undeclared (first use this function)
0_0_2046237_31645.cpp: In function `int LCA(int, int)':
0_0_2046237_31645.cpp:48: error: `swap' undeclared (first use this function)
0_0_2046237_31645.cpp: In function `int main()':
0_0_2046237_31645.cpp:58: error: `scanf' undeclared (first use this function)
0_0_2046237_31645.cpp:62: error: `a' undeclared (first use this function)
0_0_2046237_31645.cpp:62: error: `b' undeclared (first use this function)
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