Submission #668525

#	Time	Username	Problem	Language	Result	Execution time	Memory
668525		BlackJack	Swap (BOI16_swap)	C++14	100 / 100	908 ms	233956 KiB

swap

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

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"
#define fi first
#define se second

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
using db = long double;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

tcT> bool ckmin(T&a, const T&b) {
    return b < a ? a=b,1 : 0; }
tcT> bool ckmax(T&a, const T&b) {
    return b > a ? a=b,1 : 0; }

const int MOD = 1e9 + 7;
const ll INF = 1e18;

const int LG = 18;

const int MX = 2e5+5;

int N;

int A[MX];

vi dp[MX][LG<<1];

bool need[MX][LG<<1];

void mrg(vi& res, const vi&a, const vi&b) {
    for(int i = 0, j = 0, step = 1; i < sz(a) || j < sz(b); i += step, j += step, step <<= 1) {
        for(int k = 0; k < step && i + k < sz(a); k++)
            res.pb(a[i+k]);
        for(int k = 0; k < step && j + k < sz(b); k++)
            res.pb(b[j+k]);
    }
}

void solve() {
    cin >> N;
    FOR(i,1,N+1) cin >> A[i];
    need[1][0] = 1;
    for(int i = 1; 2*i + 1 <= N; i++) {
        F0R(j, LG<<1) if(need[i][j]) {
            int b = (i >> (j>>1)) ^ (j&1);
            if(A[i<<1|1] < A[i<<1] && A[i<<1|1] < A[b]) {
                need[i<<1][0] = need[i<<1|1][1] = true;
                if(j + 2 < (LG<<1)) need[i<<1|1][j+2] = need[i<<1][j+2] = true;
            }
            else {
                need[i<<1][0] = need[i<<1|1][0] = 1;
                if(j + 2 < (LG<<1)) need[i<<1][j+2] = 1;
            }
        }
    }

    ROF(i,1,N+1) {
        F0R(j, LG<<1) if(need[i][j]) {
            int b = (i >> (j>>1)) ^ (j&1);
            if((i<<1|1) <= N) {
                if(A[i<<1|1] < A[i<<1] && A[i<<1|1] < A[b]) {
                    vi opt1 = {A[i<<1|1]}, opt2 = opt1;
                    mrg(opt1, dp[i<<1][0], dp[i<<1|1][j+2]);
                    mrg(opt2, dp[i<<1][j+2], dp[i<<1|1][1]);
                    dp[i][j] = min(opt1, opt2);
                }
                else {
                    if(A[i<<1] < A[b] && A[i<<1] < A[i<<1|1]) {
                        dp[i][j] = {A[i<<1]};
                        mrg(dp[i][j], dp[i<<1][j+2], dp[i<<1|1][0]);
                    }
                    else {
                        dp[i][j] = {A[b]};
                        mrg(dp[i][j], dp[i<<1][0], dp[i<<1|1][0]);
                    }
                }
            }
            else {
                if((i<<1) <= N) {
                    dp[i][j] = {min(A[b], A[i<<1]), max(A[b], A[i<<1])};
                }
                else {
                    dp[i][j] = {A[b]};
                }
            }
        }
        if((i<<1|1) <= N) {
            F0R(j, LG<<1) {
                if(need[i<<1][j]) vi().swap(dp[i<<1][j]);
                if(need[i<<1|1][j]) vi().swap(dp[i<<1|1][j]);
            }
        }
    }
    each(e, dp[1][0]) cout << e << " ";
    cout << nl;
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

swap.cpp: In function 'void setIO(std::string)':
swap.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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