oj.uz

Submission #684719

# Submission time Handle Problem Language Result Execution time Memory
684719 2023-01-22T11:26:12 Z alvingogo Monochrome Points (JOI20_monochrome) C++14
0 / 100
 2000 ms 212 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define AquA cin.tie(0);ios_base::sync_with_stdio(0);
#define fs first
#define sc second
#define p_q priority_queue
#define int long long
using namespace std;

signed main(){
    AquA;
    int n;
    cin >> n;
    string s;
    cin >> s;
    int ans=1e14;
    vector<int> a,b;
    for(int i=0;i<n;i++){
        if(s[i]=='B'){
            a.push_back(i);
        }
        if(s[i+n]=='W'){
            b.push_back(i);
        }
    }
    int nn=n;
    n=a.size();
    vector<int> mp(n,-1);
    auto f=[&](int i){
        if(mp[i]>=0){
            return mp[i];
        }
        int xx=0;
        for(int j=0;j<n;j++){
            xx+=min(abs(b[j]-a[(i+j)%n]),nn-abs(b[j]-a[(i+j)%n]));
        }
        ans=min(ans,xx);
        mp[i]=xx;
        return xx;
    };
    int z;
    if(n){
        if(f(0)>f(n-1)){
            z=n-1;
            int l=0,r=n-1;
            while(r>l){
                int m=(l+r)/2;
                if(f(m)<=f(z)){
                    r=m;
                }
                else{
                    l=m+1;
                }
            }
            int bl=l,br=n-1;
            while(br>bl+1){
                int m=(bl+br)/2;
                if(f(m)>f(m+1)){
                    bl=m;
                }
                else{
                    br=m+1;
                }
            }
            f(bl);
            f(br);
        }
        else{
            z=0;
            int l=0,r=n-1;
            while(r>l){
                int m=(l+r+1)/2;
                if(f(m)<=f(z)){
                    l=m;
                }
                else{
                    r=m-1;
                }
            }
            int bl=0,br=l;
            while(br>bl+1){
                int m=(bl+br)/2;
                if(f(m)>f(m+1)){
                    bl=m;
                }
                else{
                    br=m+1;
                }
            }
            f(bl);
            f(br);
        }
    }
    else{
        ans=0;
    }
    cout << nn*(nn-1)/2-ans << "\n";
    return 0;
}

Subtask #1
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Execution timed out 2079 ms 212 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #2
0.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Execution timed out 2079 ms 212 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Execution timed out 2079 ms 212 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Execution timed out 2079 ms 212 KB Time limit exceeded
7 Halted 0 ms 0 KB -