Submission #563541

#	Time	Username	Problem	Language	Result	Execution time	Memory
563541		Dymo	Swap (BOI16_swap)	C++14	0 / 100	0 ms	340 KiB

swap

#include <bits/stdc++.h>
using namespace std;

#define ll  long long
#define pll pair<ll,ll>
#define ff first
#define ss second
#define pb push_back
#define endl "\n"
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

const ll maxn=2e5+10;
const ll mod=1e9+7  ;
const ll base=2e9;


/// i believe myself
/// goal 2/7

ll a[maxn];
ll b[maxn];
ll valnw[maxn];
ll pos[maxn];
bool dd[maxn];
ll par[maxn];
ll valp[maxn];

void dosth(ll i,ll j)
{
    swap(a[i],a[j]);
    swap(pos[a[i]],pos[a[j]]);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    if (fopen("t.inp","r"))
    {
        freopen("test.inp","r",stdin);
        freopen("test.out","w",stdout);
    }
    ll n;
    cin>> n;
    for (int i=1;i<=n;i++)
    {
        cin>> a[i];
        pos[a[i]]=i;
        // keep this value
    }
    for (int i=1;i<=n;i++)
    {
        pll val=make_pair(base,-1);
        if (i*2<=n) val=min(val,make_pair(a[i*2],(ll)i*2));
        if (i*2+1<=n) val=min(val,make_pair(a[i*2+1],(ll)i*2+1));
        ll nw=i/2;
        pll val1=make_pair(a[i],i/2);
        ll pospar=-1;
        while (nw)
        {
           if (!dd[nw]) val1=min(val1,make_pair(valp[nw],(ll)nw));
           if (a[i]==valp[nw])
           {
               pospar=nw;
           }
            nw/=2;
        }
        if (val1.ff==a[i]) val1.ss=max(val1.ss,pospar);
        if (val.ff>val1.ff)
        {
            dosth(i,pos[val1.ff]);
            ll nw=i/2;
            while (nw!=val1.ss)
            {
                dd[nw]=1;
            }
            dd[nw]=1;
        }
        else
        {
            if (val.ss==i*2)
            {
                dd[i]=1;
                dosth(i,i*2);
            }
            else
            {
                valp[i]=min(a[i*2],a[i]);
                dosth(i,i*2+1);
            }
        }
    }
    for (int i=1;i<=n;i++)
    {
        cout <<a[i]<<" ";
    }
}

Compilation message (stderr)

swap.cpp: In function 'int main()':
swap.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen("test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
swap.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen("test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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