cf D. Minimal Height Tree

题目

题目链接：http://codeforces.com/contest/1437/problem/D

思路

连续上升的$a[i]$放到同一根节点下

代码

#include<cstdio>
#include<cstring>
#include<cmath>
#include<cstdlib>
#include<cctype>
#include<ctime>
#include<iostream>
#include<string>
#include<map>
#include<queue>
#include<stack>
#include<set>
#include<vector>
#include<iomanip>
#include<list>
#include<bitset>
#include<sstream>
#include<fstream>
#include<complex>
#include<algorithm>
#if __cplusplus >= 201103L
#include <unordered_map>
#include <unordered_set>
#endif
#define ll long long
using namespace std;
const int INF = 0x3f3f3f3f;
int a[200010];
int main(){
	ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	int t;
	cin>>t;
	while(t--){
		int n;
		cin>>n;
		for(int i=1;i<=n;i++) cin>>a[i];
		map<int,int> mp;
		int ans=1;
		mp[0]=1;
		for(int i=2;i<=n;i++){
			if(a[i]<a[i-1]){
				mp[ans-1]--;
			}
			if(mp[ans-1]==0) ans++;//深度++ 
			mp[ans]++;//子树++ 
		}
		cout<<ans<<endl;
	}
    return 0;
}

本文地址：https://blog.csdn.net/kosf_/article/details/109348860