제출 #759336

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
759336		fanwen	Swap (BOI16_swap)	C++17	100 / 100	567 ms	3648 KiB

swap

/**
 *      author : pham van sam 
 *      created : 16 June 2023 (Friday)
 **/

#include <bits/stdc++.h>

using namespace std;
using namespace chrono;

#define MASK(x) (1LL << (x))
#define BIT(x, i) (((x) >> (i)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define REP(i, n) for (int i = 0, _n = n; i < _n; ++i)
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i, a, b) for (int i = (a), _b = (b); i >= _b; --i)
#define FORE(it, s) for (__typeof(s.begin()) it = (s).begin(); it != (s).end(); ++it)

template <typename U, typename V> bool maximize(U &A, const V &B) { return (A < B) ? (A = B, true) : false; }
template <typename U, typename V> bool minimize(U &A, const V &B) { return (A > B) ? (A = B, true) : false; }

const int MAXN = 2e5 + 5;

int N, a[MAXN];

int dp(int u, int val) {    
    if(u * 2 > N) return u;
    if(val < min(a[u * 2], a[u * 2 + 1])) return u;
    if(a[u * 2] < min(val, a[u * 2 + 1])) return dp(u * 2, val);
    int Min = min(a[u * 2], val);
    if(dp(u * 2, Min) < dp(u * 2 + 1, Min)) return (val == Min ? dp(u * 2, val) : dp(u * 2 + 1, val));
    return (val == Min ? dp(u * 2 + 1, val) : dp(u * 2, val));
}

void process(void) {
    cin >> N;
    memset(a, 0x3f, sizeof a);
    FOR(i, 1, N) cin >> a[i];

    FOR(u, 1, N) {
        if(u * 2 > N) continue;
        if(a[u] < min(a[u * 2], a[u * 2 + 1])) continue;
        if(a[u * 2] < min(a[u], a[u * 2 + 1])) {
            swap(a[u * 2], a[u]);
            continue;
        }
        swap(a[u], a[u * 2 + 1]);
        int Min = min(a[u * 2], a[u * 2 + 1]);
        if(dp(u * 2, Min) < dp(u * 2 + 1, Min)) {
            if(a[u * 2] > a[u * 2 + 1]) swap(a[u * 2], a[u * 2 + 1]);
        } else if(a[u * 2] < a[u * 2 + 1]) swap(a[u * 2], a[u * 2 + 1]);
    }
    FOR(i, 1, N) cout << a[i] << " \n"[i == N];
}

signed main() {

    #define TASK "TASK"
    if(fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }

    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    auto start_time = steady_clock::now();
    int test = 1;
    // cin >> test;
    for (int i = 1; i <= test; ++i) {
        process();
        // cout << '\n';
    }

    auto end_time = steady_clock::now();

    cerr << "\nExecution time : " << duration_cast<milliseconds> (end_time - start_time).count() << "[ms]" << endl;

    return (0 ^ 0);
}

컴파일 시 표준 에러 (stderr) 메시지

swap.cpp: In function 'int main()':
swap.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
swap.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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