View Compilation Error

0_0_34589919_25202.cpp: In function 'int main()':
0_0_34589919_25202.cpp:19:4: error: 'LL' was not declared in this scope
    LL val;
    ^
0_0_34589919_25202.cpp:20:16: error: 'val' was not declared in this scope
    scanf("%d",&val);
                ^
0_0_34589919_25202.cpp:23:5: error: 'num' was not declared in this scope
     num++;
     ^
0_0_34589919_25202.cpp:24:5: error: 'plb' was not declared in this scope
     plb x=q.top();q.pop();
     ^
0_0_34589919_25202.cpp:25:8: error: 'x' was not declared in this scope
     if(x.second==0) num--;
        ^
0_0_34589919_25202.cpp:27:14: error: 'x' was not declared in this scope
     ans+=val-x.first;//配对成功再加上值
              ^