bool IsPopOrder(vector<int> pushV,vector<int> popV) {

bool result = false;

if(pushV.size() != popV.size())

return result;

stack<int> mystack;

int j = 0;

int i=0;

for(; i < popV.size(); ){

while((j < pushV.size()) && (mystack.empty() || mystack.top() != popV[i])){

mystack.push(pushV[j]);

++j;

}

if(mystack.top() != popV[i])

break;

mystack.pop();

++i;

}

if(mystack.empty() && (i == popV.size()))

result = true;

return result;

}