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P1233 木棍加工(最长上升子序列)

飞鸟不急 2022-04-06 阅读 52
算法

P1233 木棍加工icon-default.png?t=M276https://www.luogu.com.cn/problem/P1233

#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <cstring>
#include <set>
#include <cmath>
#include <map>
#include <cstdlib>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
const int MN = 65005;
const int MAXN = 2000010;
const int INF = 0x3f3f3f3f;
#define IOS ios::sync_with_stdio(false)


typedef pair<int, int> P;
P s[MAXN];
int d[MAXN];
int main() {
	int n;
	scanf("%d", &n);
	int x, y;
	for (int i = 1; i <= n; i++) {
		scanf("%d %d", &x, &y);
		s[i] = make_pair(x, y);
	}
	sort(s + 1, s + n + 1, greater<P>() );
	/*
	for (int i = 1; i <= n; i++) {
		printf("%d %d\n", s[i].first, s[i].second);
	}*/
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		d[i] = 1;
		for (int j = 1; j < i; j++) {
			if (s[i].second > s[j].second) {
				d[i] = max(d[i], d[j] + 1);
			}
		}
		ans = max(d[i], ans);
	}
	printf("%d", ans);
	return 0;
}
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