oj.uz

Submission #595075

# Submission time Handle Problem Language Result Execution time Memory
595075 2022-07-13T10:32:36 Z elkernos Monochrome Points (JOI20_monochrome) C++17
0 / 100
 1 ms 468 KB 
#include <bits/stdc++.h>

using namespace std;

#define int long long

int32_t main()
{
    cin.tie(0)->sync_with_stdio(0);
    int n;
    cin >> n;
    vector<int> white, red;
    for(int i = 1; i <= 2 * n; i++) {
        char c;
        cin >> c;
        if(c == 'W') {
            white.emplace_back(i);
        }
        else {
            red.emplace_back(i);
        }
    }
    if(red[0] == 1) {
        swap(red, white);
    }
    int ans = 0;
    auto solve_for = [&](int k) {
        auto dist = [&](int i, int j) {
            int len = abs(j - i) - 1;
            return min(len, 2 * n - len - 2);
        };
        int cnt = 0;
        for(int i = 0; i < n; i++) {
            cnt += dist(white[i], red[(i + k) % n]);
        }
        ans = max(ans, cnt);
        return cnt;
    };
    int L = solve_for(0), R = solve_for(n - 1);
    if(L > R) {
        int l = 1, r = n - 2;
        while(l <= r) {
            int m = (l + r) / 2;
            int v1 = solve_for(m);
            if(v1 <= R) {
                r = m - 1;
                continue;
            }
            int v2 = solve_for(m + 1);
            if(v1 < v2) {
                l = m + 2;
            }
            else {
                r = m - 1;
            }
        }
    }
    else if(L < R) {
        int l = 1, r = n - 2;
        while(l <= r) {
            int m = (l + r) / 2;
            int v1 = solve_for(m);
            if(v1 <= L) {
                l = m + 1;
                continue;
            }
            int v2 = solve_for(m + 1);
            if(v1 < v2) {
                l = m + 2;
            }
            else {
                r = m - 1;
            }
        }
    }
    else {
        assert(false);
    }
    cout << ans / 2 << '\n';
}

Subtask #1
0.0 / 4.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 21.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 468 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -