제출 #245601

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
245601		thecodingwizard	Swap (BOI16_swap)	C++11	68 / 100	741 ms	262148 KiB

swap

#include <bits/stdc++.h>

using namespace std;

const int maxn = 200000;

int n, A[maxn+10];
vector<int> memo[maxn+10][36];

void merge(vector<int> &res, int root, vector<int> &L, vector<int> &R) {
    res.push_back(root);
    int lidx = 0, ridx = 0;
    int cur = 1;
    while (lidx < L.size() || ridx < R.size()) {
        for (int i = 0; i < cur; i++) {
            if (lidx < L.size()) res.push_back(L[lidx++]);
        }
        for (int i = 0; i < cur; i++) {
            if (ridx < R.size()) res.push_back(R[ridx++]);
        }
        cur *= 2;
    }
}

vector<int> &dp(int u, int par) {
    if (memo[u][par].size() > 0) return memo[u][par];
    int idx = u, p = par;
    while (p >= 2) {
        p -= 2;
        idx /= 2;
    }
    if (p == 1) idx *= 2;
    int cur = A[idx];
    int l = u*2, r = u*2+1;
    if (l > n && r > n) {
        memo[u][par].push_back(cur);
        return memo[u][par];
    } else if (r > n) {
        if (A[l] < cur) {
            memo[u][par].push_back(A[l]);
            memo[u][par].push_back(cur);
        } else {
            memo[u][par].push_back(cur);
            memo[u][par].push_back(A[l]);
        }
        return memo[u][par];
    }

    int L = A[l], R = A[r];
    // no swap
    if (cur < L && cur < R) {
        merge(memo[u][par], cur, dp(l, 0), dp(r, 0));
        return memo[u][par];
    }

    // swap left
    if (cur > L && L < R) {
        merge(memo[u][par], L, dp(l, par+2), dp(r, 0));
        return memo[u][par];
    }

    if (R < cur && R < L) {
        // swap right
        merge(memo[u][par], R, dp(l, 0), dp(r, par+2));
        vector<int> tmp;
        // swap both
        merge(tmp, R, dp(l, par+2), dp(r, 3));
        if (tmp < memo[u][par]) {
            memo[u][par] = tmp;
        }

        return memo[u][par];
    }

    assert(false);
}

int main() {
    cin.tie(0); ios_base::sync_with_stdio(0);
    cin >> n; for (int i = 1; i <= n; i++) cin >> A[i];
    vector<int> ans = dp(1, 0);
    for (int v : ans) cout << v << " ";
    cout << "\n";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

swap.cpp: In function 'void merge(std::vector<int>&, int, std::vector<int>&, std::vector<int>&)':
swap.cpp:14:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (lidx < L.size() || ridx < R.size()) {
            ~~~~~^~~~~~~~~~
swap.cpp:14:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (lidx < L.size() || ridx < R.size()) {
                               ~~~~~^~~~~~~~~~
swap.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (lidx < L.size()) res.push_back(L[lidx++]);
                 ~~~~~^~~~~~~~~~
swap.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (ridx < R.size()) res.push_back(R[ridx++]);
                 ~~~~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 20 / 20
• Subtask 5: 0 / 32