제출 #675522

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
675522		sudheerays123	무제 (POI11_tem)	C++17	0 / 100	233 ms	65536 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long int
const ll N = 100+5 , INF = 1e18 , MOD = 1e9+7;
 
void solve(){
 
	ll n;
	cin >> n;
 
	vector<pair<ll,ll>> range(n+5);
	for(ll i = 1; i <= n; i++) cin >> range[i].first >> range[i].second;
 
	vector<vector<ll>> dp(n+5,vector<ll>(3));
 
	dp[1][1] = 1;
	dp[1][2] = 1;
	ll ans = 1;
 
	for(ll i = 2; i <= n; i++){
 
		dp[i][1] = 1;
		dp[i][2] = 1;
 
		if(range[i-1].first <= range[i].first) dp[i][1] = max(dp[i][1],dp[i-1][1]+1);
		if(range[i-1].second <= range[i].first) dp[i][1] = max(dp[i][1],dp[i-1][2]+1);
 
		if(range[i-1].first <= range[i].second) dp[i][2] = max(dp[i][2],dp[i-1][1]+1);
		if(range[i-1].second <= range[i].second) dp[i][2] = dp[i-1][2]+1;
 
		ans = max({ans,dp[i][1],dp[i][2]});
	}
 
	cout << ans << "\n";
}
 
int main(){
 
	fast;
 
	ll tc = 1;
	// cin >> tc;
	while(tc--) solve();
 
	return 0;
}

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