oj.uz

Submission #613975

# Submission time Handle Problem Language Result Execution time Memory
613975 2022-07-30T15:22:59 Z HediChehaidar Monochrome Points (JOI20_monochrome) C++17
4 / 100
 19 ms 340 KB 
#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define dte  tuple<double , double , double>
using namespace std;
const int INF = 1000*1000*1000; // 1 e 9
const int MOD = 1e9 + 7;//998244353 ;
const double EPS = 0.000000001; // 1 e -9
const ll inf = (ll)1e18;

int n;
string s;
vi v[2];
int st[(int)2e6 + 10];
void update(int pos , int l , int r , int i){
    if(i > r || i  < l) return ;
    if(l == r){
        st[pos] = 1; return ;
    }
    update(2 * pos + 1 , l , (l+r) / 2 , i); update(2 * pos + 2 , (l+r) / 2 + 1 , r, i );
    st[pos] = st[2 * pos + 1] + st[2 * pos + 2];
}
int rq(int pos , int l , int r , int i  , int j){
    if(i > r || j < l) return 0;
    if(i <= l && j >= r) return st[pos];
    return rq(2 * pos + 1 , l , (l+r) / 2 , i , j) + rq(2 * pos + 2 , (l+r) / 2 + 1 , r , i , j);
}

int main(){
    //ifstream fin ("testing.txt");
    //ofstream fout ("output.txt");
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    cin>>n>>s;
    if(n > 2020) return 0;
    /*for(int i = n ; i < 2 * n ; i++){
        int id = s[i] == 'B';
        v[id].pb(i);
    }
    reverse(all(v[0]));
    reverse(all(v[1]));*/
    ll res = 0;
    for(int j = 0 ; j < n ; j++){
        for(int i = 0 ; i < 7 * n ; i++) st[i] = 0;
        int x = j + n;
        v[0].clear(); v[1].clear();
        for(int i = 0 ; i < n ; i++){
            v[s[x] == 'B'].pb(x);
            x++;
            if(x == 2 * n) x = 0;
        }
        reverse(all(v[0])); reverse(all(v[1]));
        ll ans = 0;
        for(int i = j ; i < j + n ; i++){
            int id = s[i] == 'W';
            if(v[id].back() < j){
                ans += rq(0 , 0 , 2 * n - 1 , j + n , 2 * n - 1);
                ans += rq(0 , 0 , 2 * n - 1 , 0 , v[id].back());
            }
            else ans += rq(0 , 0 , 2 * n - 1 , j + n , v[id].back());
            update(0 , 0 , 2 * n - 1 , v[id].back());
            v[id].pop_back();
        }
        //cout << ans << " ";
        res = max(res , ans);
    }
    //cout << "\n";
    cout << res << "\n";
    return 0;
}

/*
    Think of : BS / DFS / BFS / SSSP / SCC / MSP / MAX FLOW / TOPSORT / LCA / MATRIX / DP(bitmask) / 2 POINTERS / SEG TREE / MATH / UN FIND / MO / HLD
    Read the statement CAREFULLY !!
    Make a GREADY APPROACH !!!! (start from highest / lowest)
    Make your own TESTS !!
    Be careful from CORNER CASES !
*/

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct

Subtask #2
0.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 17 ms 340 KB Output is correct
15 Correct 18 ms 212 KB Output is correct
16 Correct 17 ms 340 KB Output is correct
17 Correct 19 ms 340 KB Output is correct
18 Incorrect 14 ms 340 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 17 ms 340 KB Output is correct
15 Correct 18 ms 212 KB Output is correct
16 Correct 17 ms 340 KB Output is correct
17 Correct 19 ms 340 KB Output is correct
18 Incorrect 14 ms 340 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 17 ms 340 KB Output is correct
15 Correct 18 ms 212 KB Output is correct
16 Correct 17 ms 340 KB Output is correct
17 Correct 19 ms 340 KB Output is correct
18 Incorrect 14 ms 340 KB Output isn't correct
19 Halted 0 ms 0 KB -