oj.uz

Submission #516572

# Submission time Handle Problem Language Result Execution time Memory
516572 2022-01-21T13:39:09 Z leinad2 Monochrome Points (JOI20_monochrome) C++17
35 / 100
 2000 ms 12320 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<100;i++)f(i);
        for(i=n-100;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 1 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 0 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 1 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 0 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 16 ms 332 KB Output is correct
15 Correct 17 ms 332 KB Output is correct
16 Correct 16 ms 328 KB Output is correct
17 Correct 16 ms 332 KB Output is correct
18 Correct 18 ms 204 KB Output is correct
19 Correct 14 ms 328 KB Output is correct
20 Correct 15 ms 332 KB Output is correct
21 Correct 14 ms 204 KB Output is correct
22 Correct 15 ms 336 KB Output is correct
23 Correct 9 ms 204 KB Output is correct
24 Correct 15 ms 204 KB Output is correct
25 Correct 20 ms 204 KB Output is correct
26 Correct 19 ms 204 KB Output is correct
27 Correct 18 ms 328 KB Output is correct
28 Correct 15 ms 328 KB Output is correct
29 Correct 14 ms 320 KB Output is correct
30 Correct 13 ms 332 KB Output is correct
31 Correct 16 ms 324 KB Output is correct
32 Correct 17 ms 204 KB Output is correct
33 Correct 18 ms 336 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 1 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 0 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 16 ms 332 KB Output is correct
15 Correct 17 ms 332 KB Output is correct
16 Correct 16 ms 328 KB Output is correct
17 Correct 16 ms 332 KB Output is correct
18 Correct 18 ms 204 KB Output is correct
19 Correct 14 ms 328 KB Output is correct
20 Correct 15 ms 332 KB Output is correct
21 Correct 14 ms 204 KB Output is correct
22 Correct 15 ms 336 KB Output is correct
23 Correct 9 ms 204 KB Output is correct
24 Correct 15 ms 204 KB Output is correct
25 Correct 20 ms 204 KB Output is correct
26 Correct 19 ms 204 KB Output is correct
27 Correct 18 ms 328 KB Output is correct
28 Correct 15 ms 328 KB Output is correct
29 Correct 14 ms 320 KB Output is correct
30 Correct 13 ms 332 KB Output is correct
31 Correct 16 ms 324 KB Output is correct
32 Correct 17 ms 204 KB Output is correct
33 Correct 18 ms 336 KB Output is correct
34 Correct 163 ms 404 KB Output is correct
35 Correct 137 ms 400 KB Output is correct
36 Correct 127 ms 332 KB Output is correct
37 Correct 141 ms 400 KB Output is correct
38 Correct 120 ms 392 KB Output is correct
39 Correct 130 ms 396 KB Output is correct
40 Correct 120 ms 400 KB Output is correct
41 Correct 111 ms 332 KB Output is correct
42 Correct 134 ms 332 KB Output is correct
43 Correct 137 ms 332 KB Output is correct
44 Correct 135 ms 332 KB Output is correct
45 Correct 139 ms 332 KB Output is correct
46 Correct 145 ms 332 KB Output is correct
47 Correct 134 ms 396 KB Output is correct
48 Correct 135 ms 396 KB Output is correct
49 Correct 120 ms 332 KB Output is correct
50 Correct 124 ms 396 KB Output is correct
51 Correct 150 ms 396 KB Output is correct
52 Correct 130 ms 332 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 1 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 0 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 16 ms 332 KB Output is correct
15 Correct 17 ms 332 KB Output is correct
16 Correct 16 ms 328 KB Output is correct
17 Correct 16 ms 332 KB Output is correct
18 Correct 18 ms 204 KB Output is correct
19 Correct 14 ms 328 KB Output is correct
20 Correct 15 ms 332 KB Output is correct
21 Correct 14 ms 204 KB Output is correct
22 Correct 15 ms 336 KB Output is correct
23 Correct 9 ms 204 KB Output is correct
24 Correct 15 ms 204 KB Output is correct
25 Correct 20 ms 204 KB Output is correct
26 Correct 19 ms 204 KB Output is correct
27 Correct 18 ms 328 KB Output is correct
28 Correct 15 ms 328 KB Output is correct
29 Correct 14 ms 320 KB Output is correct
30 Correct 13 ms 332 KB Output is correct
31 Correct 16 ms 324 KB Output is correct
32 Correct 17 ms 204 KB Output is correct
33 Correct 18 ms 336 KB Output is correct
34 Correct 163 ms 404 KB Output is correct
35 Correct 137 ms 400 KB Output is correct
36 Correct 127 ms 332 KB Output is correct
37 Correct 141 ms 400 KB Output is correct
38 Correct 120 ms 392 KB Output is correct
39 Correct 130 ms 396 KB Output is correct
40 Correct 120 ms 400 KB Output is correct
41 Correct 111 ms 332 KB Output is correct
42 Correct 134 ms 332 KB Output is correct
43 Correct 137 ms 332 KB Output is correct
44 Correct 135 ms 332 KB Output is correct
45 Correct 139 ms 332 KB Output is correct
46 Correct 145 ms 332 KB Output is correct
47 Correct 134 ms 396 KB Output is correct
48 Correct 135 ms 396 KB Output is correct
49 Correct 120 ms 332 KB Output is correct
50 Correct 124 ms 396 KB Output is correct
51 Correct 150 ms 396 KB Output is correct
52 Correct 130 ms 332 KB Output is correct
53 Execution timed out 2071 ms 12320 KB Time limit exceeded
54 Halted 0 ms 0 KB -