답안 #705391

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
705391	2023-03-04T09:28:29 Z	alvingogo	Tug of War (BOI15_tug)	C++14	100 / 100	1126 ms	9420 KB

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define AquA cin.tie(0);ios_base::sync_with_stdio(0);
#define fs first
#define sc second
#define p_q priority_queue
using namespace std;

/* ok, bitset!!!


wait, is it possible that their's only one contestent that wants one kind of graph?

ok, let's just eliminate these cases, because sum_deg = 8n and we have4n points to consider if we make a graph from people i to left l_i and right r_i.
if we consider all the people and make a graph

if someone's deg = 1 then we know that we should take it and its neighbor, and wow, that's a matching problem!

first: find out if it has a perfect matching
iterate all the nodes deg = 1
we know people's deg = 2 so that L and R can do this

SAMITorz 

second: bitsetorz

rings, choose the odd edges or the even edges, and do knapsack to find out if we can make the difference less then k
i want to make it like "b |= b<<k" or else

maybe the right side should have strength in [a,b];
we can find out how much we add to the right side

given an array A, an int x, for all elements C, you can add C to x or subtract C to x, find out if you can make abs(x) less then or equal to k 
isn't it knapsack?

30000*30000*2*20/64 = 9e8 :EEEEE:
CF 1e9/s la
or greedy
greedy?

fine, since it's the only method i can figure out
let's gooooooooooo :TLEthinking:
*/


bitset<600007> bt;

vector<vector<pair<int,int> > > g;
int main(){
    AquA;
	bt[0]=1;
	int n,k;
	cin >> n >> k;
	g.resize(4*n);
	vector<int> deg(4*n),vis(4*n);
	int sum=0;
	for(int i=0;i<2*n;i++){
		int a,b,s;
		cin >> a >> b >> s;
		a--;
		b--;
		sum+=s;
		g[a+2*n].push_back({i,s});
		g[i].push_back({a+2*n,s});
		g[b+3*n].push_back({i,s});
		g[i].push_back({b+3*n,s});
		deg[i]=2;
		deg[a+2*n]++;
		deg[b+3*n]++;
	}
	queue<int> q;
	for(int i=2*n;i<4*n;i++){
		if(deg[i]==1){
			q.push(i);
		}
		if(deg[i]==0){
			cout << "NO\n";
			return 0;
		}
	}
	while(q.size()){
		auto h=q.front();
		q.pop();
		int flag=0;
		for(auto y:g[h]){
			if(!vis[y.fs]){
				flag=1;
				vis[y.fs]=1;
				if(h>=3*n){
					bt<<=y.sc;
				}
				for(auto z:g[y.fs]){
					deg[z.fs]--;
					if(deg[z.fs]==1){
						q.push(z.fs);
					}
				}
			}
		}
		if(!flag){
			cout << "NO\n";
			return 0;
		}
	}
	for(int i=0;i<2*n;i++){
		if(!vis[i]){
			//dfs time :happy_mention:
			int a=0,b=0;
			for(int x=i,cnt=0,e=-1;cnt==0 || x!=i;cnt=1){
				vis[x]=1;
				for(auto f:g[x]){
					if(f.fs==e){
						continue;
					}
					if(f.fs>=3*n){
						a+=f.sc;
					}
					for(auto y:g[f.fs]){
						if(vis[y.fs] && (y.fs!=i || cnt==0)){

						}
						else{
							if(f.fs>=3*n){
								b+=y.sc;
							}
							x=y.fs;
							e=f.fs;
							break;
						}
					}
					break;
				}
			}
			//cout << a << " " << b << '\n';
			bt=(bt<<a)|(bt<<b);
		}
	}
	for(int i=0;i<=sum;i++){
		if(bt[i]){
			if(abs(i-(sum-i))<=k){
				cout << "YES\n";
				return 0;
			}
		}
	}
	cout << "NO\n";
    return 0;
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	596 KB	Output is correct
2	Correct	1 ms	596 KB	Output is correct
3	Correct	1 ms	596 KB	Output is correct
4	Correct	1 ms	724 KB	Output is correct
5	Correct	1 ms	596 KB	Output is correct
6	Correct	1 ms	668 KB	Output is correct
7	Correct	1 ms	672 KB	Output is correct
8	Correct	1 ms	596 KB	Output is correct
9	Correct	1 ms	596 KB	Output is correct
10	Correct	1 ms	596 KB	Output is correct
11	Correct	1 ms	596 KB	Output is correct
12	Correct	1 ms	596 KB	Output is correct
13	Correct	1 ms	596 KB	Output is correct
14	Correct	1 ms	596 KB	Output is correct
15	Correct	1 ms	596 KB	Output is correct
16	Correct	1 ms	596 KB	Output is correct
17	Correct	1 ms	672 KB	Output is correct
18	Correct	1 ms	596 KB	Output is correct
19	Correct	1 ms	596 KB	Output is correct
20	Correct	1 ms	596 KB	Output is correct
21	Correct	0 ms	468 KB	Output is correct
22	Correct	1 ms	596 KB	Output is correct
23	Correct	1 ms	596 KB	Output is correct
24	Correct	1 ms	676 KB	Output is correct
25	Correct	1 ms	596 KB	Output is correct

Subtask #2
30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	596 KB	Output is correct
2	Correct	1 ms	596 KB	Output is correct
3	Correct	1 ms	596 KB	Output is correct
4	Correct	1 ms	724 KB	Output is correct
5	Correct	1 ms	596 KB	Output is correct
6	Correct	1 ms	668 KB	Output is correct
7	Correct	1 ms	672 KB	Output is correct
8	Correct	1 ms	596 KB	Output is correct
9	Correct	1 ms	596 KB	Output is correct
10	Correct	1 ms	596 KB	Output is correct
11	Correct	1 ms	596 KB	Output is correct
12	Correct	1 ms	596 KB	Output is correct
13	Correct	1 ms	596 KB	Output is correct
14	Correct	1 ms	596 KB	Output is correct
15	Correct	1 ms	596 KB	Output is correct
16	Correct	1 ms	596 KB	Output is correct
17	Correct	1 ms	672 KB	Output is correct
18	Correct	1 ms	596 KB	Output is correct
19	Correct	1 ms	596 KB	Output is correct
20	Correct	1 ms	596 KB	Output is correct
21	Correct	0 ms	468 KB	Output is correct
22	Correct	1 ms	596 KB	Output is correct
23	Correct	1 ms	596 KB	Output is correct
24	Correct	1 ms	676 KB	Output is correct
25	Correct	1 ms	596 KB	Output is correct
26	Correct	61 ms	1236 KB	Output is correct
27	Correct	11 ms	1172 KB	Output is correct
28	Correct	61 ms	1168 KB	Output is correct
29	Correct	10 ms	1236 KB	Output is correct
30	Correct	62 ms	1196 KB	Output is correct
31	Correct	11 ms	1236 KB	Output is correct
32	Correct	64 ms	1236 KB	Output is correct
33	Correct	11 ms	1196 KB	Output is correct
34	Correct	10 ms	1108 KB	Output is correct
35	Correct	11 ms	1236 KB	Output is correct
36	Correct	64 ms	1236 KB	Output is correct
37	Correct	11 ms	1236 KB	Output is correct
38	Correct	61 ms	1236 KB	Output is correct
39	Correct	11 ms	1236 KB	Output is correct
40	Correct	70 ms	1192 KB	Output is correct
41	Correct	10 ms	1236 KB	Output is correct
42	Correct	65 ms	1180 KB	Output is correct
43	Correct	11 ms	1236 KB	Output is correct
44	Correct	75 ms	1236 KB	Output is correct
45	Correct	11 ms	1236 KB	Output is correct
46	Correct	75 ms	1236 KB	Output is correct
47	Correct	2 ms	980 KB	Output is correct
48	Correct	39 ms	1192 KB	Output is correct
49	Correct	38 ms	1236 KB	Output is correct
50	Correct	61 ms	1236 KB	Output is correct
51	Correct	66 ms	1236 KB	Output is correct

Subtask #3
23.0 / 23.0

#	결과	실행 시간	메모리	Grader output
1	Correct	308 ms	3436 KB	Output is correct
2	Correct	9 ms	3376 KB	Output is correct
3	Correct	298 ms	3404 KB	Output is correct
4	Correct	9 ms	3320 KB	Output is correct
5	Correct	320 ms	3424 KB	Output is correct
6	Correct	10 ms	3276 KB	Output is correct
7	Correct	376 ms	3432 KB	Output is correct
8	Correct	9 ms	3284 KB	Output is correct
9	Correct	314 ms	3424 KB	Output is correct
10	Correct	9 ms	3284 KB	Output is correct
11	Correct	302 ms	3428 KB	Output is correct
12	Correct	12 ms	3264 KB	Output is correct
13	Correct	309 ms	3436 KB	Output is correct
14	Correct	336 ms	3432 KB	Output is correct
15	Correct	9 ms	3276 KB	Output is correct
16	Correct	311 ms	3428 KB	Output is correct
17	Correct	9 ms	3284 KB	Output is correct
18	Correct	361 ms	3400 KB	Output is correct
19	Correct	9 ms	3268 KB	Output is correct
20	Correct	306 ms	3412 KB	Output is correct
21	Correct	9 ms	3284 KB	Output is correct
22	Correct	198 ms	3472 KB	Output is correct

Subtask #4
29.0 / 29.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	596 KB	Output is correct
2	Correct	1 ms	596 KB	Output is correct
3	Correct	1 ms	596 KB	Output is correct
4	Correct	1 ms	724 KB	Output is correct
5	Correct	1 ms	596 KB	Output is correct
6	Correct	1 ms	668 KB	Output is correct
7	Correct	1 ms	672 KB	Output is correct
8	Correct	1 ms	596 KB	Output is correct
9	Correct	1 ms	596 KB	Output is correct
10	Correct	1 ms	596 KB	Output is correct
11	Correct	1 ms	596 KB	Output is correct
12	Correct	1 ms	596 KB	Output is correct
13	Correct	1 ms	596 KB	Output is correct
14	Correct	1 ms	596 KB	Output is correct
15	Correct	1 ms	596 KB	Output is correct
16	Correct	1 ms	596 KB	Output is correct
17	Correct	1 ms	672 KB	Output is correct
18	Correct	1 ms	596 KB	Output is correct
19	Correct	1 ms	596 KB	Output is correct
20	Correct	1 ms	596 KB	Output is correct
21	Correct	0 ms	468 KB	Output is correct
22	Correct	1 ms	596 KB	Output is correct
23	Correct	1 ms	596 KB	Output is correct
24	Correct	1 ms	676 KB	Output is correct
25	Correct	1 ms	596 KB	Output is correct
26	Correct	61 ms	1236 KB	Output is correct
27	Correct	11 ms	1172 KB	Output is correct
28	Correct	61 ms	1168 KB	Output is correct
29	Correct	10 ms	1236 KB	Output is correct
30	Correct	62 ms	1196 KB	Output is correct
31	Correct	11 ms	1236 KB	Output is correct
32	Correct	64 ms	1236 KB	Output is correct
33	Correct	11 ms	1196 KB	Output is correct
34	Correct	10 ms	1108 KB	Output is correct
35	Correct	11 ms	1236 KB	Output is correct
36	Correct	64 ms	1236 KB	Output is correct
37	Correct	11 ms	1236 KB	Output is correct
38	Correct	61 ms	1236 KB	Output is correct
39	Correct	11 ms	1236 KB	Output is correct
40	Correct	70 ms	1192 KB	Output is correct
41	Correct	10 ms	1236 KB	Output is correct
42	Correct	65 ms	1180 KB	Output is correct
43	Correct	11 ms	1236 KB	Output is correct
44	Correct	75 ms	1236 KB	Output is correct
45	Correct	11 ms	1236 KB	Output is correct
46	Correct	75 ms	1236 KB	Output is correct
47	Correct	2 ms	980 KB	Output is correct
48	Correct	39 ms	1192 KB	Output is correct
49	Correct	38 ms	1236 KB	Output is correct
50	Correct	61 ms	1236 KB	Output is correct
51	Correct	66 ms	1236 KB	Output is correct
52	Correct	308 ms	3436 KB	Output is correct
53	Correct	9 ms	3376 KB	Output is correct
54	Correct	298 ms	3404 KB	Output is correct
55	Correct	9 ms	3320 KB	Output is correct
56	Correct	320 ms	3424 KB	Output is correct
57	Correct	10 ms	3276 KB	Output is correct
58	Correct	376 ms	3432 KB	Output is correct
59	Correct	9 ms	3284 KB	Output is correct
60	Correct	314 ms	3424 KB	Output is correct
61	Correct	9 ms	3284 KB	Output is correct
62	Correct	302 ms	3428 KB	Output is correct
63	Correct	12 ms	3264 KB	Output is correct
64	Correct	309 ms	3436 KB	Output is correct
65	Correct	336 ms	3432 KB	Output is correct
66	Correct	9 ms	3276 KB	Output is correct
67	Correct	311 ms	3428 KB	Output is correct
68	Correct	9 ms	3284 KB	Output is correct
69	Correct	361 ms	3400 KB	Output is correct
70	Correct	9 ms	3268 KB	Output is correct
71	Correct	306 ms	3412 KB	Output is correct
72	Correct	9 ms	3284 KB	Output is correct
73	Correct	198 ms	3472 KB	Output is correct
74	Correct	963 ms	8924 KB	Output is correct
75	Correct	79 ms	8908 KB	Output is correct
76	Correct	906 ms	9096 KB	Output is correct
77	Correct	77 ms	9000 KB	Output is correct
78	Correct	936 ms	9108 KB	Output is correct
79	Correct	959 ms	8924 KB	Output is correct
80	Correct	67 ms	8916 KB	Output is correct
81	Correct	73 ms	8964 KB	Output is correct
82	Correct	936 ms	8976 KB	Output is correct
83	Correct	911 ms	8924 KB	Output is correct
84	Correct	76 ms	9012 KB	Output is correct
85	Correct	1126 ms	9032 KB	Output is correct
86	Correct	72 ms	9008 KB	Output is correct
87	Correct	920 ms	9016 KB	Output is correct
88	Correct	73 ms	8908 KB	Output is correct
89	Correct	927 ms	9088 KB	Output is correct
90	Correct	72 ms	8908 KB	Output is correct
91	Correct	963 ms	9036 KB	Output is correct
92	Correct	79 ms	8908 KB	Output is correct
93	Correct	924 ms	9036 KB	Output is correct
94	Correct	32 ms	8996 KB	Output is correct
95	Correct	620 ms	9384 KB	Output is correct
96	Correct	587 ms	9420 KB	Output is correct
97	Correct	947 ms	9008 KB	Output is correct
98	Correct	921 ms	9036 KB	Output is correct

답안 #705391

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 30.0 / 30.0

Subtask #3 23.0 / 23.0

Subtask #4 29.0 / 29.0

Subtask #1
18.0 / 18.0

Subtask #2
30.0 / 30.0

Subtask #3
23.0 / 23.0

Subtask #4
29.0 / 29.0