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Submission #513873

# Submission time Handle Problem Language Result Execution time Memory
513873 2022-01-17T20:24:18 Z czhang2718 Monochrome Points (JOI20_monochrome) C++17
35 / 100
 2000 ms 12220 KB 
#include "bits/stdc++.h"
using namespace std;

const int N=400001;

int n;
string s;
int r[N], l[N];
int sum[4*N];

void upd(int i, int x, int lx, int rx){
  sum[x]++;
  if(rx-lx==1) return;
  int m=(lx+rx)/2;
  if(i<m) upd(i, 2*x+1, lx, m);
  else upd(i, 2*x+2, m, rx);
}

void upd(int i) { upd(i, 0, 0, 2*n+1); }

int get_sum(int l, int r, int x, int lx, int rx){
  if(lx>=r || rx<=l) return 0;
  if(lx>=l && rx<=r) return sum[x];
  int m=(lx+rx)/2;
  return get_sum(l, r, 2*x+1, lx, m)+get_sum(l, r, 2*x+2, m, rx);
}

int get_sum(int l, int r) { 
  if(r<=l) return 0;
  return get_sum(l, r, 0, 0, 2*n+1); 
}

int main(){
  cin.tie(0)->sync_with_stdio(0);

  cin >> n >> s;

  long long ans2=0;
  for(int t=0; t<n; t++){
    vector<int> white, black;
    for(int i=n; i<2*n; i++){
      if(s[i]=='W') white.push_back(i+1);
      else black.push_back(i+1);
    }
    int j=0, k=0;
    for(int i=0; i<n; i++){
      if(s[i]=='B') {
        l[white[j]]=i+1, r[i+1]=white[j];
        j++;
      }
      else{
        l[black[k]]=i+1, r[i+1]=black[k];
        k++;
      }
    }
    // for(int i=0; i<n; i++){
    //   cout << "r[" << i+1 << "] = " << r[i+1] << "\n";
    // }

    long long ans=0;
    for(int i=1; i<=2*n; i++){
      if(r[i]) continue;
      ans+=get_sum(l[i]+1, i);
      upd(l[i]);
    }
    ans2=max(ans2, (long long)n*(n-1)/2-ans);

    s+=s[0];
    s.erase(s.begin());
    // cout << s << "\n";

    for(int i=0; i<8*n; i++) sum[i]=0;
    for(int i=1; i<=2*n; i++){
      l[i]=r[i]=0;
    }
  }
  cout << ans2;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 0 ms 332 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 0 ms 332 KB Output is correct
14 Correct 15 ms 332 KB Output is correct
15 Correct 15 ms 360 KB Output is correct
16 Correct 17 ms 332 KB Output is correct
17 Correct 21 ms 332 KB Output is correct
18 Correct 11 ms 352 KB Output is correct
19 Correct 11 ms 352 KB Output is correct
20 Correct 12 ms 332 KB Output is correct
21 Correct 11 ms 356 KB Output is correct
22 Correct 11 ms 332 KB Output is correct
23 Correct 6 ms 332 KB Output is correct
24 Correct 11 ms 320 KB Output is correct
25 Correct 9 ms 332 KB Output is correct
26 Correct 11 ms 352 KB Output is correct
27 Correct 11 ms 332 KB Output is correct
28 Correct 16 ms 360 KB Output is correct
29 Correct 10 ms 332 KB Output is correct
30 Correct 9 ms 360 KB Output is correct
31 Correct 12 ms 332 KB Output is correct
32 Correct 12 ms 352 KB Output is correct
33 Correct 12 ms 332 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 0 ms 332 KB Output is correct
14 Correct 15 ms 332 KB Output is correct
15 Correct 15 ms 360 KB Output is correct
16 Correct 17 ms 332 KB Output is correct
17 Correct 21 ms 332 KB Output is correct
18 Correct 11 ms 352 KB Output is correct
19 Correct 11 ms 352 KB Output is correct
20 Correct 12 ms 332 KB Output is correct
21 Correct 11 ms 356 KB Output is correct
22 Correct 11 ms 332 KB Output is correct
23 Correct 6 ms 332 KB Output is correct
24 Correct 11 ms 320 KB Output is correct
25 Correct 9 ms 332 KB Output is correct
26 Correct 11 ms 352 KB Output is correct
27 Correct 11 ms 332 KB Output is correct
28 Correct 16 ms 360 KB Output is correct
29 Correct 10 ms 332 KB Output is correct
30 Correct 9 ms 360 KB Output is correct
31 Correct 12 ms 332 KB Output is correct
32 Correct 12 ms 352 KB Output is correct
33 Correct 12 ms 332 KB Output is correct
34 Correct 813 ms 448 KB Output is correct
35 Correct 840 ms 460 KB Output is correct
36 Correct 786 ms 464 KB Output is correct
37 Correct 742 ms 440 KB Output is correct
38 Correct 616 ms 332 KB Output is correct
39 Correct 731 ms 448 KB Output is correct
40 Correct 640 ms 432 KB Output is correct
41 Correct 593 ms 388 KB Output is correct
42 Correct 807 ms 452 KB Output is correct
43 Correct 754 ms 440 KB Output is correct
44 Correct 683 ms 432 KB Output is correct
45 Correct 673 ms 448 KB Output is correct
46 Correct 745 ms 448 KB Output is correct
47 Correct 715 ms 452 KB Output is correct
48 Correct 792 ms 444 KB Output is correct
49 Correct 653 ms 448 KB Output is correct
50 Correct 704 ms 444 KB Output is correct
51 Correct 728 ms 444 KB Output is correct
52 Correct 708 ms 436 KB Output is correct

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 0 ms 332 KB Output is correct
9 Correct 0 ms 332 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 0 ms 332 KB Output is correct
13 Correct 0 ms 332 KB Output is correct
14 Correct 15 ms 332 KB Output is correct
15 Correct 15 ms 360 KB Output is correct
16 Correct 17 ms 332 KB Output is correct
17 Correct 21 ms 332 KB Output is correct
18 Correct 11 ms 352 KB Output is correct
19 Correct 11 ms 352 KB Output is correct
20 Correct 12 ms 332 KB Output is correct
21 Correct 11 ms 356 KB Output is correct
22 Correct 11 ms 332 KB Output is correct
23 Correct 6 ms 332 KB Output is correct
24 Correct 11 ms 320 KB Output is correct
25 Correct 9 ms 332 KB Output is correct
26 Correct 11 ms 352 KB Output is correct
27 Correct 11 ms 332 KB Output is correct
28 Correct 16 ms 360 KB Output is correct
29 Correct 10 ms 332 KB Output is correct
30 Correct 9 ms 360 KB Output is correct
31 Correct 12 ms 332 KB Output is correct
32 Correct 12 ms 352 KB Output is correct
33 Correct 12 ms 332 KB Output is correct
34 Correct 813 ms 448 KB Output is correct
35 Correct 840 ms 460 KB Output is correct
36 Correct 786 ms 464 KB Output is correct
37 Correct 742 ms 440 KB Output is correct
38 Correct 616 ms 332 KB Output is correct
39 Correct 731 ms 448 KB Output is correct
40 Correct 640 ms 432 KB Output is correct
41 Correct 593 ms 388 KB Output is correct
42 Correct 807 ms 452 KB Output is correct
43 Correct 754 ms 440 KB Output is correct
44 Correct 683 ms 432 KB Output is correct
45 Correct 673 ms 448 KB Output is correct
46 Correct 745 ms 448 KB Output is correct
47 Correct 715 ms 452 KB Output is correct
48 Correct 792 ms 444 KB Output is correct
49 Correct 653 ms 448 KB Output is correct
50 Correct 704 ms 444 KB Output is correct
51 Correct 728 ms 444 KB Output is correct
52 Correct 708 ms 436 KB Output is correct
53 Execution timed out 2068 ms 12220 KB Time limit exceeded
54 Halted 0 ms 0 KB -