oj.uz

Submission #516574

# Submission time Handle Problem Language Result Execution time Memory
516574 2022-01-21T13:41:08 Z leinad2 Monochrome Points (JOI20_monochrome) C++17
35 / 100
 2000 ms 12248 KB 
#include<bits/stdc++.h>
using namespace std;
int n, i, j, k, a, b;
long long ans=0;
char S[400010];
vector<int>A, B;
int seg[1600010];
void init(){for(int i=0;i<8*n;i++)seg[i]=0;}
void update(int id, int s, int e, int x, int v)
{
    if(e<x||x<s)return;
    if(s==e)
    {
        seg[id]+=v;
        return;
    }
    int m=s+e>>1;
    update(id*2, s, m, x, v);update(id*2+1, m+1, e, x, v);
    seg[id]=seg[id*2]+seg[id*2+1];
}
int get(int id, int s, int e, int l, int r)
{
    if(e<l||r<s)return 0;
    if(l<=s&&e<=r)return seg[id];
    int m=s+e>>1;
    return get(id*2, s, m, l, r)+get(id*2+1, m+1, e, l, r);
}
long long f(int i)
{
    init();
    vector<pair<int, int> >V;
    for(int j=i;j<n;j++)V.push_back({A[j-i], B[j]});
    for(int j=0;j<i;j++)V.push_back({A[j+n-i], B[j]});
    for(auto &p:V)if(p.first>p.second)swap(p.first, p.second);
    sort(V.begin(), V.end());
    long long res=0;
    for(auto p:V)
    {
        int a=p.second;
        update(1, 1, 2*n, a, 1);
        res+=get(1, 1, 2*n, p.first, a-1);
    }
    ans=max(ans, res);
    return res;
}
main()
{
    scanf("%d", &n);
    scanf("%s", &S);
    for(i=0;i<2*n;i++)
    {
        if(S[i]=='B')A.push_back(i+1);
        else B.push_back(i+1);
    }
    if(n<200)for(i=0;i<n;i++)f(i);
    else
    {
        int a=0, b=n-1;
        while(a+3<=b)
        {
            int m1=(a+a+b)/3, m2=(a+b+b)/3;
            if(f(m1)>f(m2))b=m2;
            else a=m1;
        }
        for(i=a;i<=b;i++)f(i);
        for(i=0;i<25;i++)f(i);
        for(i=n-25;i<n;i++)f(i);
    }
    cout<<ans;
}

Compilation message

monochrome.cpp: In function 'void update(int, int, int, int, int)':
monochrome.cpp:17:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   17 |     int m=s+e>>1;
      |           ~^~
monochrome.cpp: In function 'int get(int, int, int, int, int)':
monochrome.cpp:25:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   25 |     int m=s+e>>1;
      |           ~^~
monochrome.cpp: At global scope:
monochrome.cpp:46:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   46 | main()
      | ^~~~
monochrome.cpp: In function 'int main()':
monochrome.cpp:49:13: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[400010]' [-Wformat=]
   49 |     scanf("%s", &S);
      |            ~^   ~~
      |             |   |
      |             |   char (*)[400010]
      |             char*
monochrome.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
monochrome.cpp:49:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |     scanf("%s", &S);
      |     ~~~~~^~~~~~~~~~

Subtask #1
4.0 / 4.0

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

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 7 ms 332 KB Output is correct
15 Correct 7 ms 332 KB Output is correct
16 Correct 6 ms 332 KB Output is correct
17 Correct 6 ms 204 KB Output is correct
18 Correct 5 ms 332 KB Output is correct
19 Correct 5 ms 204 KB Output is correct
20 Correct 5 ms 332 KB Output is correct
21 Correct 5 ms 332 KB Output is correct
22 Correct 5 ms 328 KB Output is correct
23 Correct 9 ms 312 KB Output is correct
24 Correct 5 ms 328 KB Output is correct
25 Correct 5 ms 204 KB Output is correct
26 Correct 5 ms 204 KB Output is correct
27 Correct 5 ms 204 KB Output is correct
28 Correct 6 ms 300 KB Output is correct
29 Correct 4 ms 204 KB Output is correct
30 Correct 5 ms 204 KB Output is correct
31 Correct 6 ms 204 KB Output is correct
32 Correct 8 ms 204 KB Output is correct
33 Correct 6 ms 204 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 7 ms 332 KB Output is correct
15 Correct 7 ms 332 KB Output is correct
16 Correct 6 ms 332 KB Output is correct
17 Correct 6 ms 204 KB Output is correct
18 Correct 5 ms 332 KB Output is correct
19 Correct 5 ms 204 KB Output is correct
20 Correct 5 ms 332 KB Output is correct
21 Correct 5 ms 332 KB Output is correct
22 Correct 5 ms 328 KB Output is correct
23 Correct 9 ms 312 KB Output is correct
24 Correct 5 ms 328 KB Output is correct
25 Correct 5 ms 204 KB Output is correct
26 Correct 5 ms 204 KB Output is correct
27 Correct 5 ms 204 KB Output is correct
28 Correct 6 ms 300 KB Output is correct
29 Correct 4 ms 204 KB Output is correct
30 Correct 5 ms 204 KB Output is correct
31 Correct 6 ms 204 KB Output is correct
32 Correct 8 ms 204 KB Output is correct
33 Correct 6 ms 204 KB Output is correct
34 Correct 50 ms 412 KB Output is correct
35 Correct 52 ms 420 KB Output is correct
36 Correct 53 ms 400 KB Output is correct
37 Correct 57 ms 332 KB Output is correct
38 Correct 45 ms 332 KB Output is correct
39 Correct 49 ms 396 KB Output is correct
40 Correct 42 ms 332 KB Output is correct
41 Correct 43 ms 396 KB Output is correct
42 Correct 57 ms 404 KB Output is correct
43 Correct 58 ms 332 KB Output is correct
44 Correct 49 ms 452 KB Output is correct
45 Correct 51 ms 396 KB Output is correct
46 Correct 51 ms 396 KB Output is correct
47 Correct 52 ms 332 KB Output is correct
48 Correct 50 ms 332 KB Output is correct
49 Correct 45 ms 332 KB Output is correct
50 Correct 49 ms 392 KB Output is correct
51 Correct 50 ms 332 KB Output is correct
52 Correct 50 ms 408 KB Output is correct

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 7 ms 332 KB Output is correct
15 Correct 7 ms 332 KB Output is correct
16 Correct 6 ms 332 KB Output is correct
17 Correct 6 ms 204 KB Output is correct
18 Correct 5 ms 332 KB Output is correct
19 Correct 5 ms 204 KB Output is correct
20 Correct 5 ms 332 KB Output is correct
21 Correct 5 ms 332 KB Output is correct
22 Correct 5 ms 328 KB Output is correct
23 Correct 9 ms 312 KB Output is correct
24 Correct 5 ms 328 KB Output is correct
25 Correct 5 ms 204 KB Output is correct
26 Correct 5 ms 204 KB Output is correct
27 Correct 5 ms 204 KB Output is correct
28 Correct 6 ms 300 KB Output is correct
29 Correct 4 ms 204 KB Output is correct
30 Correct 5 ms 204 KB Output is correct
31 Correct 6 ms 204 KB Output is correct
32 Correct 8 ms 204 KB Output is correct
33 Correct 6 ms 204 KB Output is correct
34 Correct 50 ms 412 KB Output is correct
35 Correct 52 ms 420 KB Output is correct
36 Correct 53 ms 400 KB Output is correct
37 Correct 57 ms 332 KB Output is correct
38 Correct 45 ms 332 KB Output is correct
39 Correct 49 ms 396 KB Output is correct
40 Correct 42 ms 332 KB Output is correct
41 Correct 43 ms 396 KB Output is correct
42 Correct 57 ms 404 KB Output is correct
43 Correct 58 ms 332 KB Output is correct
44 Correct 49 ms 452 KB Output is correct
45 Correct 51 ms 396 KB Output is correct
46 Correct 51 ms 396 KB Output is correct
47 Correct 52 ms 332 KB Output is correct
48 Correct 50 ms 332 KB Output is correct
49 Correct 45 ms 332 KB Output is correct
50 Correct 49 ms 392 KB Output is correct
51 Correct 50 ms 332 KB Output is correct
52 Correct 50 ms 408 KB Output is correct
53 Execution timed out 2052 ms 12248 KB Time limit exceeded
54 Halted 0 ms 0 KB -