답안 #285145

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
285145	2020-08-28T11:13:39 Z	AlexLuchianov	Tug of War (BOI15_tug)	C++14	100 / 100	1928 ms	3192 KB

#include <iostream>
#include <vector>
#include <cassert>
#include <cmath>
#include <bitset>

using ll = long long;
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) < (b)) ? (b) : (a))

int const nmax = 30000;
int const sigma = 20;
int strength[1 + 2 * nmax];
int l[1 + 2 * nmax], r[1 + 2 * nmax];
int count[1 + nmax * 2], weight[1 + 2 * nmax], seen[1 + 2 * nmax];
int dif = 0, n;

void dfs(int node) {
  if(count[node] != 1)
    return ;
  int id = weight[node];
  if(node <= n)
    dif += strength[id];
  else
    dif -= strength[id];
  seen[id] = 1;
  count[l[id]]--;
  count[r[id]]--;
  weight[l[id]] -= id;
  weight[r[id]] -= id;
  dfs(l[id]);
  dfs(r[id]);
}

int oth(int id, int p) {
  if(p == 1)
    return weight[r[id]] - id;
  else
    return weight[l[id]] - id;
}

int explore(int id){
  if(seen[id] == 1)
    return 0;
  int result = strength[id];
  int node = oth(id, 1);
  int last = 1, coef = -1;
  seen[id] = 1;
  while(node != id) {
    result += strength[node] * coef;
    coef *= -1;
    last ^= 1;
    seen[node] = 1;
    node = oth(node, last);
  }
  return std::max(result, -result);
}

std::bitset<5 + nmax * sigma * 2> sol;

int main() {
  int k;
  std::cin >> n >> k;
  for(int i = 1;i <= 2 * n; i++) {
    std::cin >> l[i] >> r[i] >> strength[i];
    r[i] += n;
   count[l[i]]++;
   count[r[i]]++;
   weight[l[i]] += i;
   weight[r[i]] += i;
  }
  
  for(int i = 1;i <= 2 * n; i++)  
    dfs(i);
  for(int i = 1; i <= 2 * n; i++)
    if(2 < count[i]) {
      std::cout << "NO";
      return 0;
    }
  
  sol[nmax * sigma + dif] = 1;
  
  int base = 0;

  for(int i = 1;i <= 2 * n; i++) {
    if(seen[i] == 0) {
      int val = explore(i);
      base -= val;
      sol |= (sol << (2 * val));
    }
  }

  for(int i = -k; i <= k; i++)
    if(sol[nmax * sigma + i - base] == 1) {
      std::cout << "YES";
      return 0;
    }
  std::cout << "NO";
  return 0;
}

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	768 KB	Output is correct
2	Correct	1 ms	768 KB	Output is correct
3	Correct	1 ms	768 KB	Output is correct
4	Correct	2 ms	768 KB	Output is correct
5	Correct	1 ms	768 KB	Output is correct
6	Correct	1 ms	768 KB	Output is correct
7	Correct	1 ms	768 KB	Output is correct
8	Correct	2 ms	768 KB	Output is correct
9	Correct	2 ms	768 KB	Output is correct
10	Correct	1 ms	768 KB	Output is correct
11	Correct	1 ms	768 KB	Output is correct
12	Correct	1 ms	768 KB	Output is correct
13	Correct	1 ms	768 KB	Output is correct
14	Correct	1 ms	768 KB	Output is correct
15	Correct	1 ms	768 KB	Output is correct
16	Correct	1 ms	768 KB	Output is correct
17	Correct	1 ms	768 KB	Output is correct
18	Correct	2 ms	896 KB	Output is correct
19	Correct	1 ms	768 KB	Output is correct
20	Correct	1 ms	768 KB	Output is correct
21	Correct	0 ms	384 KB	Output is correct
22	Correct	1 ms	768 KB	Output is correct
23	Correct	1 ms	768 KB	Output is correct
24	Correct	1 ms	768 KB	Output is correct
25	Correct	1 ms	768 KB	Output is correct

Subtask #2
30.0 / 30.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	768 KB	Output is correct
2	Correct	1 ms	768 KB	Output is correct
3	Correct	1 ms	768 KB	Output is correct
4	Correct	2 ms	768 KB	Output is correct
5	Correct	1 ms	768 KB	Output is correct
6	Correct	1 ms	768 KB	Output is correct
7	Correct	1 ms	768 KB	Output is correct
8	Correct	2 ms	768 KB	Output is correct
9	Correct	2 ms	768 KB	Output is correct
10	Correct	1 ms	768 KB	Output is correct
11	Correct	1 ms	768 KB	Output is correct
12	Correct	1 ms	768 KB	Output is correct
13	Correct	1 ms	768 KB	Output is correct
14	Correct	1 ms	768 KB	Output is correct
15	Correct	1 ms	768 KB	Output is correct
16	Correct	1 ms	768 KB	Output is correct
17	Correct	1 ms	768 KB	Output is correct
18	Correct	2 ms	896 KB	Output is correct
19	Correct	1 ms	768 KB	Output is correct
20	Correct	1 ms	768 KB	Output is correct
21	Correct	0 ms	384 KB	Output is correct
22	Correct	1 ms	768 KB	Output is correct
23	Correct	1 ms	768 KB	Output is correct
24	Correct	1 ms	768 KB	Output is correct
25	Correct	1 ms	768 KB	Output is correct
26	Correct	125 ms	916 KB	Output is correct
27	Correct	23 ms	896 KB	Output is correct
28	Correct	124 ms	916 KB	Output is correct
29	Correct	22 ms	896 KB	Output is correct
30	Correct	123 ms	896 KB	Output is correct
31	Correct	22 ms	896 KB	Output is correct
32	Correct	123 ms	896 KB	Output is correct
33	Correct	22 ms	896 KB	Output is correct
34	Correct	14 ms	896 KB	Output is correct
35	Correct	21 ms	896 KB	Output is correct
36	Correct	137 ms	1016 KB	Output is correct
37	Correct	22 ms	896 KB	Output is correct
38	Correct	124 ms	896 KB	Output is correct
39	Correct	23 ms	896 KB	Output is correct
40	Correct	125 ms	896 KB	Output is correct
41	Correct	22 ms	896 KB	Output is correct
42	Correct	124 ms	896 KB	Output is correct
43	Correct	26 ms	896 KB	Output is correct
44	Correct	125 ms	896 KB	Output is correct
45	Correct	25 ms	896 KB	Output is correct
46	Correct	128 ms	896 KB	Output is correct
47	Correct	6 ms	384 KB	Output is correct
48	Correct	68 ms	896 KB	Output is correct
49	Correct	68 ms	896 KB	Output is correct
50	Correct	126 ms	1016 KB	Output is correct
51	Correct	127 ms	1016 KB	Output is correct

Subtask #3
23.0 / 23.0

#	결과	실행 시간	메모리	Grader output
1	Correct	441 ms	1272 KB	Output is correct
2	Correct	25 ms	760 KB	Output is correct
3	Correct	454 ms	1280 KB	Output is correct
4	Correct	27 ms	760 KB	Output is correct
5	Correct	428 ms	1280 KB	Output is correct
6	Correct	25 ms	760 KB	Output is correct
7	Correct	431 ms	1284 KB	Output is correct
8	Correct	25 ms	760 KB	Output is correct
9	Correct	424 ms	1400 KB	Output is correct
10	Correct	25 ms	760 KB	Output is correct
11	Correct	433 ms	1288 KB	Output is correct
12	Correct	26 ms	760 KB	Output is correct
13	Correct	449 ms	1284 KB	Output is correct
14	Correct	431 ms	1400 KB	Output is correct
15	Correct	26 ms	768 KB	Output is correct
16	Correct	444 ms	1284 KB	Output is correct
17	Correct	26 ms	760 KB	Output is correct
18	Correct	437 ms	1280 KB	Output is correct
19	Correct	29 ms	760 KB	Output is correct
20	Correct	442 ms	1376 KB	Output is correct
21	Correct	26 ms	760 KB	Output is correct
22	Correct	261 ms	1272 KB	Output is correct

Subtask #4
29.0 / 29.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	768 KB	Output is correct
2	Correct	1 ms	768 KB	Output is correct
3	Correct	1 ms	768 KB	Output is correct
4	Correct	2 ms	768 KB	Output is correct
5	Correct	1 ms	768 KB	Output is correct
6	Correct	1 ms	768 KB	Output is correct
7	Correct	1 ms	768 KB	Output is correct
8	Correct	2 ms	768 KB	Output is correct
9	Correct	2 ms	768 KB	Output is correct
10	Correct	1 ms	768 KB	Output is correct
11	Correct	1 ms	768 KB	Output is correct
12	Correct	1 ms	768 KB	Output is correct
13	Correct	1 ms	768 KB	Output is correct
14	Correct	1 ms	768 KB	Output is correct
15	Correct	1 ms	768 KB	Output is correct
16	Correct	1 ms	768 KB	Output is correct
17	Correct	1 ms	768 KB	Output is correct
18	Correct	2 ms	896 KB	Output is correct
19	Correct	1 ms	768 KB	Output is correct
20	Correct	1 ms	768 KB	Output is correct
21	Correct	0 ms	384 KB	Output is correct
22	Correct	1 ms	768 KB	Output is correct
23	Correct	1 ms	768 KB	Output is correct
24	Correct	1 ms	768 KB	Output is correct
25	Correct	1 ms	768 KB	Output is correct
26	Correct	125 ms	916 KB	Output is correct
27	Correct	23 ms	896 KB	Output is correct
28	Correct	124 ms	916 KB	Output is correct
29	Correct	22 ms	896 KB	Output is correct
30	Correct	123 ms	896 KB	Output is correct
31	Correct	22 ms	896 KB	Output is correct
32	Correct	123 ms	896 KB	Output is correct
33	Correct	22 ms	896 KB	Output is correct
34	Correct	14 ms	896 KB	Output is correct
35	Correct	21 ms	896 KB	Output is correct
36	Correct	137 ms	1016 KB	Output is correct
37	Correct	22 ms	896 KB	Output is correct
38	Correct	124 ms	896 KB	Output is correct
39	Correct	23 ms	896 KB	Output is correct
40	Correct	125 ms	896 KB	Output is correct
41	Correct	22 ms	896 KB	Output is correct
42	Correct	124 ms	896 KB	Output is correct
43	Correct	26 ms	896 KB	Output is correct
44	Correct	125 ms	896 KB	Output is correct
45	Correct	25 ms	896 KB	Output is correct
46	Correct	128 ms	896 KB	Output is correct
47	Correct	6 ms	384 KB	Output is correct
48	Correct	68 ms	896 KB	Output is correct
49	Correct	68 ms	896 KB	Output is correct
50	Correct	126 ms	1016 KB	Output is correct
51	Correct	127 ms	1016 KB	Output is correct
52	Correct	441 ms	1272 KB	Output is correct
53	Correct	25 ms	760 KB	Output is correct
54	Correct	454 ms	1280 KB	Output is correct
55	Correct	27 ms	760 KB	Output is correct
56	Correct	428 ms	1280 KB	Output is correct
57	Correct	25 ms	760 KB	Output is correct
58	Correct	431 ms	1284 KB	Output is correct
59	Correct	25 ms	760 KB	Output is correct
60	Correct	424 ms	1400 KB	Output is correct
61	Correct	25 ms	760 KB	Output is correct
62	Correct	433 ms	1288 KB	Output is correct
63	Correct	26 ms	760 KB	Output is correct
64	Correct	449 ms	1284 KB	Output is correct
65	Correct	431 ms	1400 KB	Output is correct
66	Correct	26 ms	768 KB	Output is correct
67	Correct	444 ms	1284 KB	Output is correct
68	Correct	26 ms	760 KB	Output is correct
69	Correct	437 ms	1280 KB	Output is correct
70	Correct	29 ms	760 KB	Output is correct
71	Correct	442 ms	1376 KB	Output is correct
72	Correct	26 ms	760 KB	Output is correct
73	Correct	261 ms	1272 KB	Output is correct
74	Correct	1893 ms	2296 KB	Output is correct
75	Correct	170 ms	2948 KB	Output is correct
76	Correct	1919 ms	3192 KB	Output is correct
77	Correct	166 ms	3064 KB	Output is correct
78	Correct	1901 ms	3068 KB	Output is correct
79	Correct	1869 ms	3120 KB	Output is correct
80	Correct	154 ms	3064 KB	Output is correct
81	Correct	153 ms	3028 KB	Output is correct
82	Correct	1913 ms	3156 KB	Output is correct
83	Correct	1867 ms	3068 KB	Output is correct
84	Correct	152 ms	3064 KB	Output is correct
85	Correct	1857 ms	3064 KB	Output is correct
86	Correct	151 ms	2936 KB	Output is correct
87	Correct	1869 ms	3120 KB	Output is correct
88	Correct	151 ms	3044 KB	Output is correct
89	Correct	1871 ms	3036 KB	Output is correct
90	Correct	166 ms	3000 KB	Output is correct
91	Correct	1928 ms	3064 KB	Output is correct
92	Correct	160 ms	2940 KB	Output is correct
93	Correct	1911 ms	3028 KB	Output is correct
94	Correct	91 ms	2552 KB	Output is correct
95	Correct	1033 ms	2936 KB	Output is correct
96	Correct	1028 ms	3036 KB	Output is correct
97	Correct	1906 ms	3032 KB	Output is correct
98	Correct	1906 ms	3028 KB	Output is correct

답안 #285145

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