View Compilation Error

0_0_33849860_26947.cpp:5:1: error: 'map' does not name a type
 map<char, int>mp;
 ^
0_0_33849860_26947.cpp: In function 'int main()':
0_0_33849860_26947.cpp:14:2: error: 'mp' was not declared in this scope
  mp['_'] = 0; mp['a'] = 1; mp['b'] = 2; mp['c'] = 3; mp['d'] = 4; mp['e'] = 5; mp['f'] = 6; mp['g'] = 7; mp['h'] = 8; mp['i'] = 9;
  ^