View Compilation Error

0_0_31536047_11682.cpp:29:1: error: 'map' does not name a type
 map<int, int> mp[N]; //块内计数
 ^
0_0_31536047_11682.cpp: In function 'void push_down(int)':
0_0_31536047_11682.cpp:42:2: error: 'mp' was not declared in this scope
  mp[i].clear(); mp[i][lazy[i]] = block;
  ^
0_0_31536047_11682.cpp: In function 'void update()':
0_0_31536047_11682.cpp:50:4: error: 'mp' was not declared in this scope
    mp[belong[L]][arr[i]] --;
    ^
0_0_31536047_11682.cpp:57:3: error: 'mp' was not declared in this scope
   mp[belong[L]][arr[i]] --;
   ^
0_0_31536047_11682.cpp:62:3: error: 'mp' was not declared in this scope
   mp[belong[L]][arr[i]] --;
   ^
0_0_31536047_11682.cpp: In function 'int query()':
0_0_31536047_11682.cpp:79:10: error: 'mp' was not declared in this scope
   ans += mp[i][val];
          ^
0_0_31536047_11682.cpp: In function 'int main()':
0_0_31536047_11682.cpp:139:4: error: 'mp' was not declared in this scope
    mp[belong[i]][key] ++;
    ^