Submission #505236

#	Time	Username	Problem	Language	Result	Execution time	Memory
505236		colossal_pepe	Xylophone (JOI18_xylophone)	C++17	47 / 100	63 ms	324 KiB

xylophone

#include <iostream>
using namespace std;

int n, a[5005];

int query(int s, int t);
void answer(int i, int x);

int find1Pos() {
    int p = 1;
    int r = n;
    while (p < r) {
        int m = (p + r + 1) / 2;
        if (query(m, n) == n - 1)
            p = m;
        else
            r = m - 1;
    }
    return p;
}

int getVal(int cur, int p, int pp) {
    int d = query(min(cur, p), max(cur, p));
    if (a[p] + d > n) {
        return a[p] - d;
    } else if (a[p] - d < 1) {
        return a[p] + d;
    } else {
        int y = query(min(cur, pp), max(cur, pp));
        if (a[p] > a[pp]) {
            if (y == a[p] - a[pp] + d) {
                return a[p] + d;
            } else {
                return a[p] - d;
            }
        } else {
            if (y == a[pp] - a[p] + d) {
                return a[p] - d;
            } else {
                return a[p] + d;
            }
        }
    }
}

void solve(int N) {
    n = N;
    int k = find1Pos();
    a[k] = 1;
    for (int i = k - 1; i >= 1; i--) {
        a[i] = getVal(i, i + 1, i + 2);
    }
    for (int i = k + 1; i <= n; i++) {
        a[i] = getVal(i, i - 1, i - 2);
    }
    for (int i = 1; i <= n; i++) {
        answer(i, a[i]);
    }
}

• Subtask 1: 11 / 11
• Subtask 2: 36 / 36
• Subtask 3: 0 / 53