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155.min-stack.cpp
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78 lines (66 loc) · 1.19 KB
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/*
* @lc app=leetcode id=155 lang=cpp
*
* [155] Min Stack
*/
// @lc code=start
class MinStack {
public:
// vector<int> v;
// /** initialize your data structure here. */
// MinStack()
// {
// }
// void push(int x)
// {
// v.push_back(x);
// }
// void pop()
// {
// v.pop_back();
// }
// int top()
// {
// return v[v.size() - 1];
// }
// int getMin()
// {
// int ans = INT32_MAX;
// for (auto i : v)
// ans = min(ans, i);
// return ans;
// }
stack<pair<int, int>> s;
/** initialize your data structure here. */
MinStack()
{
}
void push(int x)
{
if (s.empty())
s.push({x, x});
else
s.push({x, min(x, s.top().second)});
}
void pop()
{
s.pop();
}
int top()
{
return s.top().first;
}
int getMin()
{
return s.top().second;
}
};
/**
* Your MinStack object will be instantiated and called as such:
* MinStack* obj = new MinStack();
* obj->push(x);
* obj->pop();
* int param_3 = obj->top();
* int param_4 = obj->getMin();
*/
// @lc code=end