View Compilation Error

0_0_33537836_9088.cpp: In function 'int main()':
0_0_33537836_9088.cpp:20:7: error: 'struct std::pair<Node, int>' has no member named 'clear'
   mmp.clear();//用来确保不重复的 
       ^
0_0_33537836_9088.cpp:25:13: error: no match for 'operator[]' (operand types are 'std::pair<Node, int>' and 'Node')
          mmp[ro[i]]++; 
             ^
0_0_33537836_9088.cpp:37:10: error: no match for 'operator[]' (operand types are 'std::pair<Node, int>' and 'Node')
    if(mmp[ro[Stack[i]]]>1)ans--;
          ^