View Compilation Error

0_0_2754619_14369.cpp: In function `int main()':
0_0_2754619_14369.cpp:16: error: `M' undeclared (first use this function)
0_0_2754619_14369.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2754619_14369.cpp:18: error: `map' undeclared (first use this function)