int Solution::largestRectangleArea(vector<int> &height) {
int n=height.size();
stack<int>s;
int value=0;
s.push(0);
for(int i=1; i<n; i++){
if(s.empty() || height[i]>=height[s.top()]){
s.push(i);
}
else {
while(!s.empty() and height[s.top()]>height[i]){
int val=height[s.top()];
s.pop();
int area;
if(s.empty()){
area=val*i;
value=max(value,area);
}
else{
area=val*(i-s.top()-1);
value=max(value,area);
}
}
s.push(i);
}
}
while(!s.empty()){
int val=height[s.top()];
s.pop();
int area;
if(s.empty()){
area=val*n;
value=max(value,area);
}
else{
area=val*(n-s.top()-1);
value=max(value,area);
}
}
return value;
}
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