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long calculateTotalRegion(vector<int> heights) {
int n = heights.size();
vector<int> left(n, 1), right(n, 1);
stack<int> st;
for (int i = 0; i < n; ++i) {
while (!st.empty() && heights[st.top()] <= heights[i]) {
st.pop();
}
if (!st.empty()) {
left[i] = i - st.top();
} else {
left[i] = i + 1;
}
st.push(i);
}
while (!st.empty()) {
st.pop();
}
for (int i = n - 1; i >= 0; --i) {
while (!st.empty() && heights[st.top()] <= heights[i]) {
st.pop();
}
if (!st.empty()) {
right[i] = st.top() - i;
} else {
right[i] = n - i;
}
st.push(i);
}
long totalRegion = 0;
for (int i = 0; i < n; ++i) {
totalRegion += left[i] + right[i] - 1;
}
return totalRegion;
}
