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class MinStack {

stack<int> s;

stack<int> min;

public:

/** initialize your data structure here. */

MinStack() {

}

void push(int x) {

s.push(x);

if (min.empty()) {

min.push(x);

} else {

int cur = min.top();

if (x < cur) {

min.push(x);

} else {

min.push(cur);

}

}

}

void pop() {

s.pop();

min.pop();

}

int top() {

return s.top();

}

int getMin() {

return min.top();

}

};