MSTICK - Wooden Sticks

Tác giả: happyboy99x

Ngôn ngữ: C++

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;

const int MXV = 10000, N = 5000;
pair<int, int> a[N];
int n, lst[N];

void enter() {
	scanf("%d", &n);
	for(int i = 0; i < n; ++i)
		scanf("%d%d", &a[i].first, &a[i].second);
}

void solve() {
	sort(a, a+n);
	int maxlen = 1; lst[0] = a[n-1].second;
	for(int i = n-2; i >= 0; --i) {
		int dp = lower_bound(lst, lst+maxlen, a[i].second) - lst;
		if(dp == maxlen) ++maxlen, lst[dp] = a[i].second;
		else lst[dp] = min(lst[dp], a[i].second);
	}
	printf("%d\n", maxlen);
}

int main() {
	int tc; scanf("%d", &tc);
	while(tc--) enter(), solve();
	return 0;
}

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