View Compilation Error

693066_0_0_20432.cpp: In function `void dfs(int)':
693066_0_0_20432.cpp:50: error: `memcpy' undeclared (first use this function)
693066_0_0_20432.cpp:50: error: (Each undeclared identifier is reported only once for each function it appears in.)
693066_0_0_20432.cpp: In function `int main()':
693066_0_0_20432.cpp:102: error: `swap' undeclared (first use this function)
693066_0_0_20432.cpp:117: error: `INF' undeclared (first use this function)