Submission #573440

#	Time	Username	Problem	Language	Result	Execution time	Memory
573440		Tien_Noob	Swap (BOI16_swap)	C++17	100 / 100	53 ms	5200 KiB

swap

//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
#define Log2(x) 31 - __builtin_clz(x)
using namespace std;
const int N = 4e5 + 1;
int a[N + 1], dp[N + 1], n;
int get(int u)
{
    if (dp[u] == 0)
    {
        return a[u];
    }
    if (u & 1)
    {
        if (dp[u - 1] == 0)
        {
            return get(u/2);
        }
        else if (dp[u - 1] == 1)
        {
            return a[u - 1];
        }
        else if (dp[u - 1] == 2)
        {
            return min(get(u/2), a[u - 1]);
        }
    }
    else
    {
        if (dp[u] == 1)
        {
            return get(u/2);
        }
        else
        {
            return min(get(u/2), a[u]);
        }
    }
}
void recolor(int u, int x)
{
    if (dp[u] == 0)
    {
        return ;
    }
    if (u & 1)
    {
        if (dp[u - 1] == 0)
        {
            recolor(u/2, x);
        }
        else if (dp[u - 1] == 1)
        {
            return ;
        }
        else
        {
            if (a[u - 1] == x)
            {
                dp[u - 1] = 1;
                return ;
            }
            dp[u - 1] = 0;
            recolor(u/2, x);
        }
    }
    else
    {
        if (dp[u] == 2)
        {
            if (a[u] == x)
            {
                dp[u] = 0;
                return ;
            }
            dp[u] = 1;
        }
        recolor(u/2, x);
    }
}
void read()
{
    cin >> n;
    memset(a, 0x3f, sizeof(a));
    for (int i = 1; i <= n; ++ i)
    {
        cin >> a[i];
    }
}
void solve()
{
    for (int i = 1; i <= n; ++ i)
    {
        int x = get(i), y = min(a[i * 2], a[i * 2 + 1]);
        if (x < min(a[i * 2], a[i * 2 + 1]))
        {
            cout << x << ' ';
            recolor(i, x);
        }
        else
        {
            cout << y << ' ';
            if (a[i * 2] < a[i * 2 + 1])
            {
                dp[i * 2] = 1;
                dp[i * 2 + 1] = 0;
            }
            else
            {
                dp[i * 2] = 2;
                dp[i * 2 + 1] = 1;
            }
        }
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }
    int t = 1;
    bool typetest = false;
    if (typetest)
    {
        cin >> t;
    }
    for (int __ = 1; __ <= t; ++ __)
    {
        //cout << "Case #" << __ << ":" << '\n';
        read();
        solve();
    }
}

Compilation message (stderr)

swap.cpp: In function 'int get(int)':
swap.cpp:41:1: warning: control reaches end of non-void function [-Wreturn-type]
   41 | }
      | ^
swap.cpp: In function 'int main()':
swap.cpp:124:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  124 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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