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Submission #949881

# Submission time Handle Problem Language Result Execution time Memory
949881 2024-03-19T19:39:19 Z fuad27 Alternating Current (BOI18_alternating) C++17
33 / 100
 2193 ms 2392 KB 
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
mt19937 rng(chrono::steady_clock().now().time_since_epoch().count());
long double P(int old, int nw, long double temp) {
  if(nw < old)return 1.0;
  return exp((old-nw)/temp);

}
vector<int> mask;
vector<pair<int,int>> a;
int n, m;
int eval() {
  int cnt1[n+1], cnt2[n+1];
  memset(cnt1, 0, sizeof cnt1);
  memset(cnt2, 0, sizeof cnt2);
  for(int i = 0;i<m;i++) {
    if(mask[i]) {
      if(a[i].second>=a[i].first) {
        cnt1[a[i].first]++;
        cnt1[a[i].second+1]--;
      }
      else {
        cnt1[a[i].first]++;
        cnt1[0]++;
        cnt1[a[i].second+1]--;
      }
    }
    else {
      if(a[i].second>=a[i].first) {
        cnt2[a[i].first]++;
        cnt2[a[i].second+1]--;
      }
      else {
        cnt2[a[i].first]++;
        cnt2[0]++;
        cnt2[a[i].second+1]--;
      }
    }
  }
  for(int i = 1;i<=n;i++) {
    cnt1[i]+=cnt1[i-1];
    cnt2[i]+=cnt2[i-1];
  }
  int cc=0;
  for(int i = 0;i<n;i++) {
    if(cnt1[i]<=0)cc++;
    if(cnt2[i]<=0)cc++;
  }
  return cc;
}
int main () {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n >> m;
  auto start=clock();
  mask.resize(m);
  a.resize(m);
  for(int i = 0;i<m;i++){
    cin >> a[i].first >> a[i].second;
    a[i].first--;
    a[i].second--;
  }
  while((long double)(clock()-start)/CLOCKS_PER_SEC < 1.5) {
    long double temp = 1000;
    for(int i = 0;i<m;i++)mask[i]=rng()%2;
    int old = eval();
    for(int i = 0;i<5000;i++) {
      int c = rng()%m;
      mask[c]^=1;
      int nw = eval();
      if(nw==0) {
        for(int i:mask)cout << i;
        cout << "\n";
        return 0;
      }
      long double rn = (long double)(rng()%1000)/1000;
      if(P(old, nw, temp)>rn) {
        old=nw;
      }
      else {
        mask[c]^=1;
      }
      temp*=0.95;
    }
//    cerr << fixed << setprecision(5) << (long double)temp << endl;
  }
  cout << "impossible\n";
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1501 ms 444 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1501 ms 428 KB Output is correct
11 Correct 1501 ms 432 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1500 ms 432 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1501 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1501 ms 436 KB Output is correct
30 Correct 1500 ms 432 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1501 ms 428 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 1501 ms 432 KB Output is correct
35 Correct 1501 ms 428 KB Output is correct
36 Correct 0 ms 344 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 1501 ms 432 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1501 ms 444 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1501 ms 428 KB Output is correct
11 Correct 1501 ms 432 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1500 ms 432 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1501 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1501 ms 436 KB Output is correct
30 Correct 1500 ms 432 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1501 ms 428 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 1501 ms 432 KB Output is correct
35 Correct 1501 ms 428 KB Output is correct
36 Correct 0 ms 344 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 1501 ms 432 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 0 ms 600 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 201 ms 432 KB Output is correct
44 Correct 1 ms 344 KB Output is correct
45 Correct 2 ms 348 KB Output is correct
46 Correct 40 ms 344 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 1501 ms 428 KB Output is correct
49 Correct 0 ms 348 KB Output is correct
50 Correct 1501 ms 432 KB Output is correct
51 Correct 1502 ms 436 KB Output is correct
52 Correct 1502 ms 428 KB Output is correct
53 Correct 1501 ms 436 KB Output is correct
54 Correct 2 ms 344 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 15 ms 456 KB Output is correct
57 Correct 1 ms 600 KB Output is correct
58 Correct 87 ms 428 KB Output is correct
59 Correct 0 ms 348 KB Output is correct
60 Correct 8 ms 460 KB Output is correct
61 Correct 1 ms 348 KB Output is correct
62 Correct 1502 ms 432 KB Output is correct
63 Correct 1501 ms 432 KB Output is correct
64 Correct 0 ms 348 KB Output is correct
65 Correct 1501 ms 428 KB Output is correct
66 Correct 0 ms 344 KB Output is correct
67 Correct 1 ms 348 KB Output is correct
68 Correct 0 ms 348 KB Output is correct
69 Correct 1 ms 348 KB Output is correct

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1501 ms 444 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1501 ms 428 KB Output is correct
11 Correct 1501 ms 432 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1500 ms 432 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1501 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1501 ms 436 KB Output is correct
30 Correct 1500 ms 432 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1501 ms 428 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 1501 ms 432 KB Output is correct
35 Correct 1501 ms 428 KB Output is correct
36 Correct 0 ms 344 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 1501 ms 432 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 0 ms 600 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 201 ms 432 KB Output is correct
44 Correct 1 ms 344 KB Output is correct
45 Correct 2 ms 348 KB Output is correct
46 Correct 40 ms 344 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 1501 ms 428 KB Output is correct
49 Correct 0 ms 348 KB Output is correct
50 Correct 1501 ms 432 KB Output is correct
51 Correct 1502 ms 436 KB Output is correct
52 Correct 1502 ms 428 KB Output is correct
53 Correct 1501 ms 436 KB Output is correct
54 Correct 2 ms 344 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 15 ms 456 KB Output is correct
57 Correct 1 ms 600 KB Output is correct
58 Correct 87 ms 428 KB Output is correct
59 Correct 0 ms 348 KB Output is correct
60 Correct 8 ms 460 KB Output is correct
61 Correct 1 ms 348 KB Output is correct
62 Correct 1502 ms 432 KB Output is correct
63 Correct 1501 ms 432 KB Output is correct
64 Correct 0 ms 348 KB Output is correct
65 Correct 1501 ms 428 KB Output is correct
66 Correct 0 ms 344 KB Output is correct
67 Correct 1 ms 348 KB Output is correct
68 Correct 0 ms 348 KB Output is correct
69 Correct 1 ms 348 KB Output is correct
70 Correct 0 ms 348 KB Output is correct
71 Incorrect 1506 ms 452 KB 'impossible' claimed, but there is a solution
72 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 2392 KB Output is correct
2 Correct 751 ms 1116 KB Output is correct
3 Correct 2173 ms 1816 KB Output is correct
4 Incorrect 2193 ms 1812 KB 'impossible' claimed, but there is a solution
5 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1501 ms 444 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1501 ms 428 KB Output is correct
11 Correct 1501 ms 432 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1500 ms 432 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 344 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1501 ms 348 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 1501 ms 436 KB Output is correct
30 Correct 1500 ms 432 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1501 ms 428 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 1501 ms 432 KB Output is correct
35 Correct 1501 ms 428 KB Output is correct
36 Correct 0 ms 344 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 1501 ms 432 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 0 ms 600 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 201 ms 432 KB Output is correct
44 Correct 1 ms 344 KB Output is correct
45 Correct 2 ms 348 KB Output is correct
46 Correct 40 ms 344 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 1501 ms 428 KB Output is correct
49 Correct 0 ms 348 KB Output is correct
50 Correct 1501 ms 432 KB Output is correct
51 Correct 1502 ms 436 KB Output is correct
52 Correct 1502 ms 428 KB Output is correct
53 Correct 1501 ms 436 KB Output is correct
54 Correct 2 ms 344 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 15 ms 456 KB Output is correct
57 Correct 1 ms 600 KB Output is correct
58 Correct 87 ms 428 KB Output is correct
59 Correct 0 ms 348 KB Output is correct
60 Correct 8 ms 460 KB Output is correct
61 Correct 1 ms 348 KB Output is correct
62 Correct 1502 ms 432 KB Output is correct
63 Correct 1501 ms 432 KB Output is correct
64 Correct 0 ms 348 KB Output is correct
65 Correct 1501 ms 428 KB Output is correct
66 Correct 0 ms 344 KB Output is correct
67 Correct 1 ms 348 KB Output is correct
68 Correct 0 ms 348 KB Output is correct
69 Correct 1 ms 348 KB Output is correct
70 Correct 0 ms 348 KB Output is correct
71 Incorrect 1506 ms 452 KB 'impossible' claimed, but there is a solution
72 Halted 0 ms 0 KB -