답안 #705392

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
705392	2023-03-04T09:31:52 Z	alvingogo	Tug of War (BOI15_tug)	C++14	100 / 100	2139 ms	9208 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<1200007> 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	2 ms	1016 KB	Output is correct
2	Correct	2 ms	1024 KB	Output is correct
3	Correct	2 ms	980 KB	Output is correct
4	Correct	2 ms	980 KB	Output is correct
5	Correct	2 ms	980 KB	Output is correct
6	Correct	1 ms	980 KB	Output is correct
7	Correct	1 ms	980 KB	Output is correct
8	Correct	1 ms	980 KB	Output is correct
9	Correct	2 ms	980 KB	Output is correct
10	Correct	1 ms	980 KB	Output is correct
11	Correct	1 ms	980 KB	Output is correct
12	Correct	1 ms	980 KB	Output is correct
13	Correct	1 ms	980 KB	Output is correct
14	Correct	1 ms	980 KB	Output is correct
15	Correct	2 ms	980 KB	Output is correct
16	Correct	2 ms	1020 KB	Output is correct
17	Correct	1 ms	980 KB	Output is correct
18	Correct	2 ms	1020 KB	Output is correct
19	Correct	2 ms	980 KB	Output is correct
20	Correct	2 ms	1056 KB	Output is correct
21	Correct	1 ms	724 KB	Output is correct
22	Correct	1 ms	1020 KB	Output is correct
23	Correct	2 ms	980 KB	Output is correct
24	Correct	2 ms	980 KB	Output is correct
25	Correct	2 ms	980 KB	Output is correct

Subtask #2
30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	1016 KB	Output is correct
2	Correct	2 ms	1024 KB	Output is correct
3	Correct	2 ms	980 KB	Output is correct
4	Correct	2 ms	980 KB	Output is correct
5	Correct	2 ms	980 KB	Output is correct
6	Correct	1 ms	980 KB	Output is correct
7	Correct	1 ms	980 KB	Output is correct
8	Correct	1 ms	980 KB	Output is correct
9	Correct	2 ms	980 KB	Output is correct
10	Correct	1 ms	980 KB	Output is correct
11	Correct	1 ms	980 KB	Output is correct
12	Correct	1 ms	980 KB	Output is correct
13	Correct	1 ms	980 KB	Output is correct
14	Correct	1 ms	980 KB	Output is correct
15	Correct	2 ms	980 KB	Output is correct
16	Correct	2 ms	1020 KB	Output is correct
17	Correct	1 ms	980 KB	Output is correct
18	Correct	2 ms	1020 KB	Output is correct
19	Correct	2 ms	980 KB	Output is correct
20	Correct	2 ms	1056 KB	Output is correct
21	Correct	1 ms	724 KB	Output is correct
22	Correct	1 ms	1020 KB	Output is correct
23	Correct	2 ms	980 KB	Output is correct
24	Correct	2 ms	980 KB	Output is correct
25	Correct	2 ms	980 KB	Output is correct
26	Correct	138 ms	1492 KB	Output is correct
27	Correct	25 ms	1492 KB	Output is correct
28	Correct	148 ms	1548 KB	Output is correct
29	Correct	22 ms	1492 KB	Output is correct
30	Correct	137 ms	1492 KB	Output is correct
31	Correct	19 ms	1492 KB	Output is correct
32	Correct	126 ms	1492 KB	Output is correct
33	Correct	20 ms	1492 KB	Output is correct
34	Correct	11 ms	1540 KB	Output is correct
35	Correct	24 ms	1492 KB	Output is correct
36	Correct	124 ms	1492 KB	Output is correct
37	Correct	19 ms	1492 KB	Output is correct
38	Correct	125 ms	1492 KB	Output is correct
39	Correct	21 ms	1492 KB	Output is correct
40	Correct	134 ms	1492 KB	Output is correct
41	Correct	24 ms	1492 KB	Output is correct
42	Correct	124 ms	1492 KB	Output is correct
43	Correct	19 ms	1492 KB	Output is correct
44	Correct	139 ms	1492 KB	Output is correct
45	Correct	19 ms	1536 KB	Output is correct
46	Correct	139 ms	1492 KB	Output is correct
47	Correct	2 ms	1236 KB	Output is correct
48	Correct	88 ms	1616 KB	Output is correct
49	Correct	79 ms	1620 KB	Output is correct
50	Correct	134 ms	1492 KB	Output is correct
51	Correct	132 ms	1492 KB	Output is correct

Subtask #3
23.0 / 23.0

#	결과	실행 시간	메모리	Grader output
1	Correct	631 ms	3700 KB	Output is correct
2	Correct	9 ms	3412 KB	Output is correct
3	Correct	654 ms	3708 KB	Output is correct
4	Correct	10 ms	3412 KB	Output is correct
5	Correct	653 ms	3712 KB	Output is correct
6	Correct	9 ms	3412 KB	Output is correct
7	Correct	668 ms	3700 KB	Output is correct
8	Correct	9 ms	3412 KB	Output is correct
9	Correct	647 ms	3704 KB	Output is correct
10	Correct	9 ms	3412 KB	Output is correct
11	Correct	711 ms	3704 KB	Output is correct
12	Correct	9 ms	3396 KB	Output is correct
13	Correct	656 ms	3716 KB	Output is correct
14	Correct	680 ms	3704 KB	Output is correct
15	Correct	9 ms	3412 KB	Output is correct
16	Correct	645 ms	3700 KB	Output is correct
17	Correct	11 ms	3452 KB	Output is correct
18	Correct	653 ms	3668 KB	Output is correct
19	Correct	9 ms	3460 KB	Output is correct
20	Correct	684 ms	3592 KB	Output is correct
21	Correct	10 ms	3424 KB	Output is correct
22	Correct	396 ms	3824 KB	Output is correct

Subtask #4
29.0 / 29.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	1016 KB	Output is correct
2	Correct	2 ms	1024 KB	Output is correct
3	Correct	2 ms	980 KB	Output is correct
4	Correct	2 ms	980 KB	Output is correct
5	Correct	2 ms	980 KB	Output is correct
6	Correct	1 ms	980 KB	Output is correct
7	Correct	1 ms	980 KB	Output is correct
8	Correct	1 ms	980 KB	Output is correct
9	Correct	2 ms	980 KB	Output is correct
10	Correct	1 ms	980 KB	Output is correct
11	Correct	1 ms	980 KB	Output is correct
12	Correct	1 ms	980 KB	Output is correct
13	Correct	1 ms	980 KB	Output is correct
14	Correct	1 ms	980 KB	Output is correct
15	Correct	2 ms	980 KB	Output is correct
16	Correct	2 ms	1020 KB	Output is correct
17	Correct	1 ms	980 KB	Output is correct
18	Correct	2 ms	1020 KB	Output is correct
19	Correct	2 ms	980 KB	Output is correct
20	Correct	2 ms	1056 KB	Output is correct
21	Correct	1 ms	724 KB	Output is correct
22	Correct	1 ms	1020 KB	Output is correct
23	Correct	2 ms	980 KB	Output is correct
24	Correct	2 ms	980 KB	Output is correct
25	Correct	2 ms	980 KB	Output is correct
26	Correct	138 ms	1492 KB	Output is correct
27	Correct	25 ms	1492 KB	Output is correct
28	Correct	148 ms	1548 KB	Output is correct
29	Correct	22 ms	1492 KB	Output is correct
30	Correct	137 ms	1492 KB	Output is correct
31	Correct	19 ms	1492 KB	Output is correct
32	Correct	126 ms	1492 KB	Output is correct
33	Correct	20 ms	1492 KB	Output is correct
34	Correct	11 ms	1540 KB	Output is correct
35	Correct	24 ms	1492 KB	Output is correct
36	Correct	124 ms	1492 KB	Output is correct
37	Correct	19 ms	1492 KB	Output is correct
38	Correct	125 ms	1492 KB	Output is correct
39	Correct	21 ms	1492 KB	Output is correct
40	Correct	134 ms	1492 KB	Output is correct
41	Correct	24 ms	1492 KB	Output is correct
42	Correct	124 ms	1492 KB	Output is correct
43	Correct	19 ms	1492 KB	Output is correct
44	Correct	139 ms	1492 KB	Output is correct
45	Correct	19 ms	1536 KB	Output is correct
46	Correct	139 ms	1492 KB	Output is correct
47	Correct	2 ms	1236 KB	Output is correct
48	Correct	88 ms	1616 KB	Output is correct
49	Correct	79 ms	1620 KB	Output is correct
50	Correct	134 ms	1492 KB	Output is correct
51	Correct	132 ms	1492 KB	Output is correct
52	Correct	631 ms	3700 KB	Output is correct
53	Correct	9 ms	3412 KB	Output is correct
54	Correct	654 ms	3708 KB	Output is correct
55	Correct	10 ms	3412 KB	Output is correct
56	Correct	653 ms	3712 KB	Output is correct
57	Correct	9 ms	3412 KB	Output is correct
58	Correct	668 ms	3700 KB	Output is correct
59	Correct	9 ms	3412 KB	Output is correct
60	Correct	647 ms	3704 KB	Output is correct
61	Correct	9 ms	3412 KB	Output is correct
62	Correct	711 ms	3704 KB	Output is correct
63	Correct	9 ms	3396 KB	Output is correct
64	Correct	656 ms	3716 KB	Output is correct
65	Correct	680 ms	3704 KB	Output is correct
66	Correct	9 ms	3412 KB	Output is correct
67	Correct	645 ms	3700 KB	Output is correct
68	Correct	11 ms	3452 KB	Output is correct
69	Correct	653 ms	3668 KB	Output is correct
70	Correct	9 ms	3460 KB	Output is correct
71	Correct	684 ms	3592 KB	Output is correct
72	Correct	10 ms	3424 KB	Output is correct
73	Correct	396 ms	3824 KB	Output is correct
74	Correct	2126 ms	8788 KB	Output is correct
75	Correct	109 ms	8652 KB	Output is correct
76	Correct	1977 ms	8716 KB	Output is correct
77	Correct	107 ms	8672 KB	Output is correct
78	Correct	2114 ms	8712 KB	Output is correct
79	Correct	1924 ms	8712 KB	Output is correct
80	Correct	124 ms	8712 KB	Output is correct
81	Correct	105 ms	8660 KB	Output is correct
82	Correct	1870 ms	8716 KB	Output is correct
83	Correct	1864 ms	8780 KB	Output is correct
84	Correct	113 ms	8716 KB	Output is correct
85	Correct	1912 ms	8708 KB	Output is correct
86	Correct	104 ms	8716 KB	Output is correct
87	Correct	2005 ms	8720 KB	Output is correct
88	Correct	116 ms	8660 KB	Output is correct
89	Correct	1895 ms	8712 KB	Output is correct
90	Correct	110 ms	8708 KB	Output is correct
91	Correct	2041 ms	8712 KB	Output is correct
92	Correct	121 ms	8708 KB	Output is correct
93	Correct	1977 ms	8708 KB	Output is correct
94	Correct	29 ms	8596 KB	Output is correct
95	Correct	1273 ms	9096 KB	Output is correct
96	Correct	1270 ms	9208 KB	Output is correct
97	Correct	2040 ms	8716 KB	Output is correct
98	Correct	2139 ms	8704 KB	Output is correct

답안 #705392

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