Submission #1280020

#	Time	Username	Problem	Language	Result	Execution time	Memory
1280020		longdeptrai	Swap (BOI16_swap)	C++20	21 / 100	1095 ms	720 KiB

swap

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
//using namespace __gnu_pbds;
#define LongDepTrai "swap"
#define ll long long
#define ull unsigned long long
#define ld long double
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define pll pair<ll,ll>
#define vi vector<int>
#define vii vector<ii>
#define vll vector<ll>
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) int((x).size())
#define order_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>

inline ll add(ll a, ll b, ll mod){ a += b; if(a >= mod) a -= mod; return a; }
inline ll sub(ll a, ll b, ll mod){ a -= b; if(a < 0) a += mod; return a; }
inline ll mul(ll a, ll b, ll mod){ return ( (ll)a * b ) % mod; }

static mt19937_64 rng((unsigned)chrono::steady_clock::now().time_since_epoch().count());
const int N=2e5+9;
int n,a[N];
vi best,tmp;
void Try(int i){
    if(i>n/2){
        for(int j=n/2+1;j<=n;j++) tmp.pb(a[j]);
        best=min(best,tmp);
        for(int j=n/2+1;j<=n;j++) tmp.pop_back();
        return;
    }

    if(a[i]<min(a[i*2],a[i*2+1])) {
        tmp.pb(a[i]);
        Try(i+1);
        tmp.pop_back();
    }
    else
    if(a[i*2]<min(a[i],a[i*2+1])){
        swap(a[i],a[i*2]);
        tmp.pb(a[i]);
        Try(i+1);
        tmp.pop_back();
        swap(a[i],a[i*2]);
    }
    else
    if(a[i*2+1]<min(a[i],a[i*2])){
        swap(a[i],a[i*2]);
        swap(a[i],a[i*2+1]);
        tmp.pb(a[i]);
        Try(i+1);
        tmp.pop_back();
        swap(a[i],a[i*2+1]);
        swap(a[i],a[i*2]);

        swap(a[i],a[i*2+1]);
        tmp.pb(a[i]);
        Try(i+1);
        tmp.pop_back();
        swap(a[i],a[i*2+1]);
    }

}
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);

    if(fopen(LongDepTrai".inp","r")){
        freopen(LongDepTrai".inp","r",stdin);
        freopen(LongDepTrai".out","w",stdout);
    }
    best.pb(1000000000);
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    a[n+1]=1000000000;
    Try(1);
    for(int x:best) cout<<x<<" ";


    return 0;
}

Compilation message (stderr)

swap.cpp: In function 'int main()':
swap.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen(LongDepTrai".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
swap.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(LongDepTrai".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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