View Compilation Error

0_0_36679313_19140.cpp:45:1: error: 'map' does not name a type
 map<char,int>M;
 ^
0_0_36679313_19140.cpp: In function 'int bfs(int, int, int, int)':
0_0_36679313_19140.cpp:71:19: error: 'M' was not declared in this scope
 B.time = A.time + M[a[xx][yy]];
                   ^
0_0_36679313_19140.cpp: In function 'int main()':
0_0_36679313_19140.cpp:84:1: error: 'M' was not declared in this scope
 M.clear();
 ^