oj.uz

Submission #683828

# Submission time Handle Problem Language Result Execution time Memory
683828 2023-01-19T12:20:15 Z Fysty Monochrome Points (JOI20_monochrome) C++17
100 / 100
 403 ms 6192 KB 
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
#define MottoHayaku ios::sync_with_stdio(false);cin.tie(0);
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define F first
#define S second
#define pb push_back

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int N=4e5+5;
struct BIT
{
    int a[N];
    void init()
    {
        rep1(i,N-1) a[i]=0;
    }
    void upd(int x,int val)
    {
        for(;x<N;x+=x&-x) a[x]+=val;
    }
    int qry(int x)
    {
        int ret=0;
        for(;x;x-=x&-x) ret+=a[x];
        return ret;
    }
} bit;
int n,to[N];
vector<int> a,b;
string s;
ll getans(int i)
{
    i=(i%n+n)%n;
    rep(j,n)
    {
        to[a[j]]=b[(j+i)%n];
        to[b[(j+i)%n]]=a[j];
    }
    bit.init();
    ll tot=0;
    rep1(j,n*2)
    {
        if(to[j]<j) bit.upd(j,-1);
        else
        {
            tot+=bit.qry(to[j]);
            bit.upd(to[j],1);
        }
    }
    return tot;
}
signed main()
{
    MottoHayaku
    cin>>n>>s;
    //rep(i,n) s+="BW";
    //shuffle(s.begin(),s.end(),rng);
    //cout<<n<<"\n"<<s<<"\n";
    rep(i,n*2)
    {
        if(s[i]=='B') a.pb(i+1);
        else b.pb(i+1);
    }
    if(n<=2000)
    {
        ll ans=0;
        rep(i,n) ans=max(ans,getans(i));
        cout<<ans<<"\n";
        return 0;
    }
    int l=rng()%n;
    int r=l+n-1;
    while(l<r)
    {
        int mid=l+r+1>>1;
        ll x=getans(mid)-getans(mid-1);
        if(x>0) l=mid;
        else r=mid-1;
    }
    cout<<getans(l)<<"\n";
}

Compilation message

monochrome.cpp: In function 'int main()':
monochrome.cpp:83:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   83 |         int mid=l+r+1>>1;
      |                 ~~~^~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1876 KB Output is correct
2 Correct 1 ms 1776 KB Output is correct
3 Correct 2 ms 1876 KB Output is correct
4 Correct 1 ms 1876 KB Output is correct
5 Correct 2 ms 1876 KB Output is correct
6 Correct 2 ms 1876 KB Output is correct
7 Correct 1 ms 1876 KB Output is correct
8 Correct 2 ms 1876 KB Output is correct
9 Correct 1 ms 1876 KB Output is correct
10 Correct 2 ms 1876 KB Output is correct
11 Correct 1 ms 1876 KB Output is correct
12 Correct 1 ms 1876 KB Output is correct
13 Correct 1 ms 1876 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1876 KB Output is correct
2 Correct 1 ms 1776 KB Output is correct
3 Correct 2 ms 1876 KB Output is correct
4 Correct 1 ms 1876 KB Output is correct
5 Correct 2 ms 1876 KB Output is correct
6 Correct 2 ms 1876 KB Output is correct
7 Correct 1 ms 1876 KB Output is correct
8 Correct 2 ms 1876 KB Output is correct
9 Correct 1 ms 1876 KB Output is correct
10 Correct 2 ms 1876 KB Output is correct
11 Correct 1 ms 1876 KB Output is correct
12 Correct 1 ms 1876 KB Output is correct
13 Correct 1 ms 1876 KB Output is correct
14 Correct 21 ms 1876 KB Output is correct
15 Correct 19 ms 1872 KB Output is correct
16 Correct 21 ms 1904 KB Output is correct
17 Correct 18 ms 1904 KB Output is correct
18 Correct 15 ms 1876 KB Output is correct
19 Correct 16 ms 1900 KB Output is correct
20 Correct 16 ms 1912 KB Output is correct
21 Correct 16 ms 1876 KB Output is correct
22 Correct 18 ms 1868 KB Output is correct
23 Correct 11 ms 1904 KB Output is correct
24 Correct 20 ms 1876 KB Output is correct
25 Correct 15 ms 2004 KB Output is correct
26 Correct 15 ms 1876 KB Output is correct
27 Correct 18 ms 1872 KB Output is correct
28 Correct 17 ms 1876 KB Output is correct
29 Correct 14 ms 1908 KB Output is correct
30 Correct 15 ms 1908 KB Output is correct
31 Correct 22 ms 1908 KB Output is correct
32 Correct 18 ms 1908 KB Output is correct
33 Correct 18 ms 1876 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1876 KB Output is correct
2 Correct 1 ms 1776 KB Output is correct
3 Correct 2 ms 1876 KB Output is correct
4 Correct 1 ms 1876 KB Output is correct
5 Correct 2 ms 1876 KB Output is correct
6 Correct 2 ms 1876 KB Output is correct
7 Correct 1 ms 1876 KB Output is correct
8 Correct 2 ms 1876 KB Output is correct
9 Correct 1 ms 1876 KB Output is correct
10 Correct 2 ms 1876 KB Output is correct
11 Correct 1 ms 1876 KB Output is correct
12 Correct 1 ms 1876 KB Output is correct
13 Correct 1 ms 1876 KB Output is correct
14 Correct 21 ms 1876 KB Output is correct
15 Correct 19 ms 1872 KB Output is correct
16 Correct 21 ms 1904 KB Output is correct
17 Correct 18 ms 1904 KB Output is correct
18 Correct 15 ms 1876 KB Output is correct
19 Correct 16 ms 1900 KB Output is correct
20 Correct 16 ms 1912 KB Output is correct
21 Correct 16 ms 1876 KB Output is correct
22 Correct 18 ms 1868 KB Output is correct
23 Correct 11 ms 1904 KB Output is correct
24 Correct 20 ms 1876 KB Output is correct
25 Correct 15 ms 2004 KB Output is correct
26 Correct 15 ms 1876 KB Output is correct
27 Correct 18 ms 1872 KB Output is correct
28 Correct 17 ms 1876 KB Output is correct
29 Correct 14 ms 1908 KB Output is correct
30 Correct 15 ms 1908 KB Output is correct
31 Correct 22 ms 1908 KB Output is correct
32 Correct 18 ms 1908 KB Output is correct
33 Correct 18 ms 1876 KB Output is correct
34 Correct 357 ms 1928 KB Output is correct
35 Correct 314 ms 1896 KB Output is correct
36 Correct 290 ms 1928 KB Output is correct
37 Correct 303 ms 2000 KB Output is correct
38 Correct 243 ms 1928 KB Output is correct
39 Correct 276 ms 1932 KB Output is correct
40 Correct 262 ms 1920 KB Output is correct
41 Correct 226 ms 1932 KB Output is correct
42 Correct 298 ms 1928 KB Output is correct
43 Correct 284 ms 1936 KB Output is correct
44 Correct 252 ms 1920 KB Output is correct
45 Correct 309 ms 1924 KB Output is correct
46 Correct 279 ms 1928 KB Output is correct
47 Correct 281 ms 1924 KB Output is correct
48 Correct 307 ms 1932 KB Output is correct
49 Correct 239 ms 1916 KB Output is correct
50 Correct 292 ms 1924 KB Output is correct
51 Correct 306 ms 1924 KB Output is correct
52 Correct 290 ms 1932 KB Output is correct

Subtask #4
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1876 KB Output is correct
2 Correct 1 ms 1776 KB Output is correct
3 Correct 2 ms 1876 KB Output is correct
4 Correct 1 ms 1876 KB Output is correct
5 Correct 2 ms 1876 KB Output is correct
6 Correct 2 ms 1876 KB Output is correct
7 Correct 1 ms 1876 KB Output is correct
8 Correct 2 ms 1876 KB Output is correct
9 Correct 1 ms 1876 KB Output is correct
10 Correct 2 ms 1876 KB Output is correct
11 Correct 1 ms 1876 KB Output is correct
12 Correct 1 ms 1876 KB Output is correct
13 Correct 1 ms 1876 KB Output is correct
14 Correct 21 ms 1876 KB Output is correct
15 Correct 19 ms 1872 KB Output is correct
16 Correct 21 ms 1904 KB Output is correct
17 Correct 18 ms 1904 KB Output is correct
18 Correct 15 ms 1876 KB Output is correct
19 Correct 16 ms 1900 KB Output is correct
20 Correct 16 ms 1912 KB Output is correct
21 Correct 16 ms 1876 KB Output is correct
22 Correct 18 ms 1868 KB Output is correct
23 Correct 11 ms 1904 KB Output is correct
24 Correct 20 ms 1876 KB Output is correct
25 Correct 15 ms 2004 KB Output is correct
26 Correct 15 ms 1876 KB Output is correct
27 Correct 18 ms 1872 KB Output is correct
28 Correct 17 ms 1876 KB Output is correct
29 Correct 14 ms 1908 KB Output is correct
30 Correct 15 ms 1908 KB Output is correct
31 Correct 22 ms 1908 KB Output is correct
32 Correct 18 ms 1908 KB Output is correct
33 Correct 18 ms 1876 KB Output is correct
34 Correct 357 ms 1928 KB Output is correct
35 Correct 314 ms 1896 KB Output is correct
36 Correct 290 ms 1928 KB Output is correct
37 Correct 303 ms 2000 KB Output is correct
38 Correct 243 ms 1928 KB Output is correct
39 Correct 276 ms 1932 KB Output is correct
40 Correct 262 ms 1920 KB Output is correct
41 Correct 226 ms 1932 KB Output is correct
42 Correct 298 ms 1928 KB Output is correct
43 Correct 284 ms 1936 KB Output is correct
44 Correct 252 ms 1920 KB Output is correct
45 Correct 309 ms 1924 KB Output is correct
46 Correct 279 ms 1928 KB Output is correct
47 Correct 281 ms 1924 KB Output is correct
48 Correct 307 ms 1932 KB Output is correct
49 Correct 239 ms 1916 KB Output is correct
50 Correct 292 ms 1924 KB Output is correct
51 Correct 306 ms 1924 KB Output is correct
52 Correct 290 ms 1932 KB Output is correct
53 Correct 396 ms 5824 KB Output is correct
54 Correct 388 ms 5920 KB Output is correct
55 Correct 403 ms 5936 KB Output is correct
56 Correct 384 ms 5976 KB Output is correct
57 Correct 348 ms 5848 KB Output is correct
58 Correct 359 ms 5940 KB Output is correct
59 Correct 321 ms 5680 KB Output is correct
60 Correct 333 ms 6044 KB Output is correct
61 Correct 348 ms 6148 KB Output is correct
62 Correct 342 ms 6112 KB Output is correct
63 Correct 339 ms 5984 KB Output is correct
64 Correct 351 ms 5732 KB Output is correct
65 Correct 333 ms 5852 KB Output is correct
66 Correct 323 ms 5732 KB Output is correct
67 Correct 333 ms 5732 KB Output is correct
68 Correct 325 ms 5504 KB Output is correct
69 Correct 345 ms 5976 KB Output is correct
70 Correct 311 ms 5592 KB Output is correct
71 Correct 369 ms 5856 KB Output is correct
72 Correct 347 ms 5860 KB Output is correct
73 Correct 371 ms 6192 KB Output is correct