답안 #667184

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
667184	2022-11-30T16:13:55 Z	Kahou	Tug of War (BOI15_tug)	C++14	100 / 100	101 ms	9028 KB

tug

// radal lanat bet.

#include<bits/stdc++.h>
using namespace std;
#define F first
#define s second
#define endl '\n'
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll,ll> pll;

const int N = 6e4 + 5;
int n, k, s[N], bk[N], to[N], from[N], t, dp[N], w[N][2], cnt[20*N], X;
int vis[N], mark[N];
int CC[N];
int sum;
vector<int> adj[N];
vector<int> vc[N];
vector<int> pth;

bitset<20*N> bs;

void dfs(int u, int p) {
	vis[u] = 1;
	CC[u] = t;
	for (int id:adj[u]) {
		if (id == p) continue;
		int v = to[id]^from[id]^u;
		if (!vis[v]) {
			pth.push_back(id);
			dfs(v, id);
			pth.pop_back();
		}
		else if (vis[v] == 1) {
			bk[t]++;
			if (!vc[t].empty()) continue;
			int pt = pth.size()-1;
			mark[from[id]] = mark[to[id]] = 1;
			vc[t].push_back(id);
			while (pt > 0 && from[pth[pt]] != v && to[pth[pt]] != v) {
				mark[from[pth[pt]]] = mark[to[pth[pt]]] = 1;
				vc[t].push_back(pth[pt--]);
			}
			mark[from[pth[pt]]] = mark[to[pth[pt]]] = 1;
			vc[t].push_back(pth[pt]);
		}
	}
	vis[u] = 2;
}

void dfs2(int u, int p) {
	for (int id:adj[u]) {
		int v = from[id]^to[id]^u;
		if (v == p || mark[v]) continue;
		dfs2(v, u);
		dp[u] += dp[v];
		if (u <= n) dp[u] += s[id];
	}
}

void solve() {
	cin >> n >> k;
	for (int i = 1; i <= 2*n; i++) {
		int l, r;
		cin >> l >> r >> s[i];
		r += n;
		adj[l].push_back(i);
		adj[r].push_back(i);
		from[i] = l;
		to[i] = r;
		sum += s[i];
	}
	
	for (int u = 1; u <= 2*n; u++) {
		if (!vis[u]) {
			t++;
			dfs(u, 0);
			if (bk[t] > 1) {
				cout << "NO" << endl;
				return;
			}
		}
	}
	for (int u = 1; u <= 2*n; u++) {
		if (mark[u]) {
			dfs2(u, 0);
			w[CC[u]][0] += dp[u];
			w[CC[u]][1] += dp[u];
		}
	}
	for (int x = 1; x <= t; x++) {
		for (int i = 0; i < (int)vc[x].size(); i++) {
			int id = vc[x][i];
			w[x][i&1] += s[id];
		}
	}

	for (int x = 1; x <= t; x++) {
		if (w[x][0] > w[x][1]) swap(w[x][0], w[x][1]);
		X += w[x][0];
		cnt[w[x][1]-w[x][0]]++;
	}

	if (X > (sum+k)/2) {
		cout << "NO" << endl;
		return;
	}
	if (X >= (sum-k+1)/2) {
		cout << "YES" << endl;
		return;
	}
	
	for (int x = 1; x < 20*N; x++) {
		while (cnt[x] >= 3) {
			cnt[x] -= 2;
			cnt[x<<1]++;
		}
	}
	bs[0] = 1;
	for (int x = 1; x < 20*N; x++) {
		for (int i = 1; i <= cnt[x]; i++) {
			bs = (bs<<x*i)|bs;
		}
	}

	int iy = bs._Find_next((sum-k+1)/2-X-1);
	cout << (iy <= (sum+k)/2-X ? "YES":"NO") << endl;
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	solve();
	return 0;
}

Subtask #1

18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	3540 KB	Output is correct
2	Correct	7 ms	3624 KB	Output is correct
3	Correct	7 ms	3572 KB	Output is correct
4	Correct	8 ms	3700 KB	Output is correct
5	Correct	8 ms	3524 KB	Output is correct
6	Correct	7 ms	3540 KB	Output is correct
7	Correct	8 ms	3624 KB	Output is correct
8	Correct	7 ms	3540 KB	Output is correct
9	Correct	8 ms	3540 KB	Output is correct
10	Correct	8 ms	3576 KB	Output is correct
11	Correct	7 ms	3616 KB	Output is correct
12	Correct	7 ms	3624 KB	Output is correct
13	Correct	7 ms	3620 KB	Output is correct
14	Correct	7 ms	3568 KB	Output is correct
15	Correct	7 ms	3628 KB	Output is correct
16	Correct	7 ms	3632 KB	Output is correct
17	Correct	7 ms	3540 KB	Output is correct
18	Correct	7 ms	3540 KB	Output is correct
19	Correct	10 ms	3540 KB	Output is correct
20	Correct	2 ms	3412 KB	Output is correct
21	Correct	2 ms	3412 KB	Output is correct
22	Correct	3 ms	3412 KB	Output is correct
23	Correct	8 ms	3540 KB	Output is correct
24	Correct	7 ms	3620 KB	Output is correct
25	Correct	8 ms	3624 KB	Output is correct

Subtask #2

30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	3540 KB	Output is correct
2	Correct	7 ms	3624 KB	Output is correct
3	Correct	7 ms	3572 KB	Output is correct
4	Correct	8 ms	3700 KB	Output is correct
5	Correct	8 ms	3524 KB	Output is correct
6	Correct	7 ms	3540 KB	Output is correct
7	Correct	8 ms	3624 KB	Output is correct
8	Correct	7 ms	3540 KB	Output is correct
9	Correct	8 ms	3540 KB	Output is correct
10	Correct	8 ms	3576 KB	Output is correct
11	Correct	7 ms	3616 KB	Output is correct
12	Correct	7 ms	3624 KB	Output is correct
13	Correct	7 ms	3620 KB	Output is correct
14	Correct	7 ms	3568 KB	Output is correct
15	Correct	7 ms	3628 KB	Output is correct
16	Correct	7 ms	3632 KB	Output is correct
17	Correct	7 ms	3540 KB	Output is correct
18	Correct	7 ms	3540 KB	Output is correct
19	Correct	10 ms	3540 KB	Output is correct
20	Correct	2 ms	3412 KB	Output is correct
21	Correct	2 ms	3412 KB	Output is correct
22	Correct	3 ms	3412 KB	Output is correct
23	Correct	8 ms	3540 KB	Output is correct
24	Correct	7 ms	3620 KB	Output is correct
25	Correct	8 ms	3624 KB	Output is correct
26	Correct	12 ms	3924 KB	Output is correct
27	Correct	20 ms	3924 KB	Output is correct
28	Correct	13 ms	4052 KB	Output is correct
29	Correct	19 ms	3924 KB	Output is correct
30	Correct	13 ms	3924 KB	Output is correct
31	Correct	20 ms	3844 KB	Output is correct
32	Correct	12 ms	3924 KB	Output is correct
33	Correct	19 ms	3924 KB	Output is correct
34	Correct	10 ms	3924 KB	Output is correct
35	Correct	24 ms	3924 KB	Output is correct
36	Correct	13 ms	3984 KB	Output is correct
37	Correct	19 ms	3924 KB	Output is correct
38	Correct	13 ms	3972 KB	Output is correct
39	Correct	20 ms	3820 KB	Output is correct
40	Correct	13 ms	3992 KB	Output is correct
41	Correct	22 ms	3840 KB	Output is correct
42	Correct	13 ms	3924 KB	Output is correct
43	Correct	20 ms	3924 KB	Output is correct
44	Correct	13 ms	3924 KB	Output is correct
45	Correct	20 ms	3924 KB	Output is correct
46	Correct	13 ms	3964 KB	Output is correct
47	Correct	3 ms	3684 KB	Output is correct
48	Correct	4 ms	3712 KB	Output is correct
49	Correct	4 ms	3796 KB	Output is correct
50	Correct	11 ms	3996 KB	Output is correct
51	Correct	10 ms	3940 KB	Output is correct

Subtask #3

23.0 / 23.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	5140 KB	Output is correct
2	Correct	11 ms	4592 KB	Output is correct
3	Correct	11 ms	5120 KB	Output is correct
4	Correct	9 ms	4608 KB	Output is correct
5	Correct	9 ms	5204 KB	Output is correct
6	Correct	8 ms	4596 KB	Output is correct
7	Correct	12 ms	5204 KB	Output is correct
8	Correct	8 ms	4564 KB	Output is correct
9	Correct	11 ms	5120 KB	Output is correct
10	Correct	8 ms	4692 KB	Output is correct
11	Correct	10 ms	5124 KB	Output is correct
12	Correct	8 ms	4564 KB	Output is correct
13	Correct	10 ms	5232 KB	Output is correct
14	Correct	10 ms	5124 KB	Output is correct
15	Correct	10 ms	4608 KB	Output is correct
16	Correct	10 ms	5204 KB	Output is correct
17	Correct	11 ms	4576 KB	Output is correct
18	Correct	11 ms	5204 KB	Output is correct
19	Correct	8 ms	4564 KB	Output is correct
20	Correct	9 ms	5160 KB	Output is correct
21	Correct	9 ms	5124 KB	Output is correct
22	Correct	12 ms	4988 KB	Output is correct

Subtask #4

29.0 / 29.0

#	결과	실행 시간	메모리	Grader output
1	Correct	7 ms	3540 KB	Output is correct
2	Correct	7 ms	3624 KB	Output is correct
3	Correct	7 ms	3572 KB	Output is correct
4	Correct	8 ms	3700 KB	Output is correct
5	Correct	8 ms	3524 KB	Output is correct
6	Correct	7 ms	3540 KB	Output is correct
7	Correct	8 ms	3624 KB	Output is correct
8	Correct	7 ms	3540 KB	Output is correct
9	Correct	8 ms	3540 KB	Output is correct
10	Correct	8 ms	3576 KB	Output is correct
11	Correct	7 ms	3616 KB	Output is correct
12	Correct	7 ms	3624 KB	Output is correct
13	Correct	7 ms	3620 KB	Output is correct
14	Correct	7 ms	3568 KB	Output is correct
15	Correct	7 ms	3628 KB	Output is correct
16	Correct	7 ms	3632 KB	Output is correct
17	Correct	7 ms	3540 KB	Output is correct
18	Correct	7 ms	3540 KB	Output is correct
19	Correct	10 ms	3540 KB	Output is correct
20	Correct	2 ms	3412 KB	Output is correct
21	Correct	2 ms	3412 KB	Output is correct
22	Correct	3 ms	3412 KB	Output is correct
23	Correct	8 ms	3540 KB	Output is correct
24	Correct	7 ms	3620 KB	Output is correct
25	Correct	8 ms	3624 KB	Output is correct
26	Correct	12 ms	3924 KB	Output is correct
27	Correct	20 ms	3924 KB	Output is correct
28	Correct	13 ms	4052 KB	Output is correct
29	Correct	19 ms	3924 KB	Output is correct
30	Correct	13 ms	3924 KB	Output is correct
31	Correct	20 ms	3844 KB	Output is correct
32	Correct	12 ms	3924 KB	Output is correct
33	Correct	19 ms	3924 KB	Output is correct
34	Correct	10 ms	3924 KB	Output is correct
35	Correct	24 ms	3924 KB	Output is correct
36	Correct	13 ms	3984 KB	Output is correct
37	Correct	19 ms	3924 KB	Output is correct
38	Correct	13 ms	3972 KB	Output is correct
39	Correct	20 ms	3820 KB	Output is correct
40	Correct	13 ms	3992 KB	Output is correct
41	Correct	22 ms	3840 KB	Output is correct
42	Correct	13 ms	3924 KB	Output is correct
43	Correct	20 ms	3924 KB	Output is correct
44	Correct	13 ms	3924 KB	Output is correct
45	Correct	20 ms	3924 KB	Output is correct
46	Correct	13 ms	3964 KB	Output is correct
47	Correct	3 ms	3684 KB	Output is correct
48	Correct	4 ms	3712 KB	Output is correct
49	Correct	4 ms	3796 KB	Output is correct
50	Correct	11 ms	3996 KB	Output is correct
51	Correct	10 ms	3940 KB	Output is correct
52	Correct	10 ms	5140 KB	Output is correct
53	Correct	11 ms	4592 KB	Output is correct
54	Correct	11 ms	5120 KB	Output is correct
55	Correct	9 ms	4608 KB	Output is correct
56	Correct	9 ms	5204 KB	Output is correct
57	Correct	8 ms	4596 KB	Output is correct
58	Correct	12 ms	5204 KB	Output is correct
59	Correct	8 ms	4564 KB	Output is correct
60	Correct	11 ms	5120 KB	Output is correct
61	Correct	8 ms	4692 KB	Output is correct
62	Correct	10 ms	5124 KB	Output is correct
63	Correct	8 ms	4564 KB	Output is correct
64	Correct	10 ms	5232 KB	Output is correct
65	Correct	10 ms	5124 KB	Output is correct
66	Correct	10 ms	4608 KB	Output is correct
67	Correct	10 ms	5204 KB	Output is correct
68	Correct	11 ms	4576 KB	Output is correct
69	Correct	11 ms	5204 KB	Output is correct
70	Correct	8 ms	4564 KB	Output is correct
71	Correct	9 ms	5160 KB	Output is correct
72	Correct	9 ms	5124 KB	Output is correct
73	Correct	12 ms	4988 KB	Output is correct
74	Correct	38 ms	8956 KB	Output is correct
75	Correct	76 ms	8068 KB	Output is correct
76	Correct	40 ms	8908 KB	Output is correct
77	Correct	75 ms	8072 KB	Output is correct
78	Correct	40 ms	8908 KB	Output is correct
79	Correct	61 ms	9004 KB	Output is correct
80	Correct	89 ms	8072 KB	Output is correct
81	Correct	40 ms	8000 KB	Output is correct
82	Correct	32 ms	9028 KB	Output is correct
83	Correct	42 ms	8908 KB	Output is correct
84	Correct	78 ms	8068 KB	Output is correct
85	Correct	49 ms	8988 KB	Output is correct
86	Correct	101 ms	8056 KB	Output is correct
87	Correct	41 ms	9024 KB	Output is correct
88	Correct	76 ms	8004 KB	Output is correct
89	Correct	41 ms	8944 KB	Output is correct
90	Correct	80 ms	8068 KB	Output is correct
91	Correct	42 ms	9016 KB	Output is correct
92	Correct	80 ms	7956 KB	Output is correct
93	Correct	42 ms	8984 KB	Output is correct
94	Correct	30 ms	8436 KB	Output is correct
95	Correct	35 ms	8376 KB	Output is correct
96	Correct	34 ms	8392 KB	Output is correct
97	Correct	44 ms	8928 KB	Output is correct
98	Correct	37 ms	8956 KB	Output is correct