Submission #588685

#	Time	Username	Problem	Language	Result	Execution time	Memory
588685		MohammadAghil	Swap (BOI16_swap)	C++17	0 / 100	28 ms	48468 KiB

swap

      #include <bits/stdc++.h>
//   #pragma GCC optimize ("Ofast,unroll-loops")
// #pragma GCC target ("avx2")
    using namespace std;
  typedef long long ll;
   typedef pair<ll, ll> pp;
    #define er(args ...) cerr << __LINE__ << ": ", err(new istringstream(string(#args)), args), cerr << endl
      #define per(i,r,l) for(int i = (r); i >= (l); i--)
        #define rep(i,l,r) for(int i = (l); i < (r); i++)
           #define all(x) begin(x), end(x)
              #define sz(x) (int)(x).size()
                  #define pb push_back
                      #define ss second
                           #define ff first
                                   void err(istringstream *iss){}template<typename T,typename ...Args> void err(istringstream *iss,const T &_val, const Args&...args){string _name;*iss>>_name;if(_name.back()==',')_name.pop_back();cerr<<_name<<" = "<<_val<<", ",err(iss,args...);}
void IOS(){
     cin.tie(0) -> sync_with_stdio(0);
     #ifndef ONLINE_JUDGE
          freopen("in.in", "r", stdin);
          freopen("out.out", "w", stdout);
     #endif
}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll mod = 998244353, maxn = 5e4 + 5, lg = 40, inf = ll(1e9) + 5;
ll pw(ll a,ll b,ll md=mod){if(!b)return 1;ll k=pw(a,b>>1ll);return k*k%md*(b&1ll?a:1)%md;}

int a[maxn], n;
vector<int> cand[maxn], dp[maxn][lg];

int get(int u, int x){
     return lower_bound(all(cand[u]), x) - begin(cand[u]);
}

vector<int> get(int r, int p, int lx, int rx){
     vector<int> cand, resl = dp[r<<1][get(r<<1, lx)], resr = dp[r<<1|1][get(r<<1|1, rx)];
     cand.reserve(sz(dp[r<<1][0]) + sz(dp[r<<1|1][0]) + 1); cand.pb(a[p]);
     int ptr1 = 0, ptr2 = 0, st = 0;
     while(ptr1 < sz(resl) || ptr2 < sz(resr)){
          int k = 1<<st;
          while(k && ptr1 < sz(resl)) cand.pb(resl[ptr1++]), k--;
          k = 1<<st;
          while(k && ptr2 < sz(resr)) cand.pb(resr[ptr2++]), k--;
          st++;
     }
     return cand;
}

void dfs(int r){
     int cnt = 0;
     if(r<<1 <= n) dfs(r<<1), cnt++;
     if(r<<1 < n) dfs(r<<1|1), cnt++;
     rep(i,0,sz(cand[r])){
          int x = cand[r][i];
          if(cnt == 0) dp[r][i].pb(a[x]);
          else if(cnt == 1){
               dp[r][i].pb(a[x]), dp[r][i].pb(a[r<<1]);
               if(a[x] > a[r<<1]) swap(dp[r][i][0], dp[r][i][1]); 
          }else{
               int lx = r<<1, rx = r<<1|1;
               if(a[x] < a[lx] && a[x] < a[rx]) dp[r][i] = get(r, x, lx, rx);
               else if(a[lx] < a[x] && a[x] < a[rx]) dp[r][i] = get(r, lx, x, rx);
               else if(a[lx] < a[rx] && a[rx] < a[x]) dp[r][i] = get(r, lx, x, rx);
               else dp[r][i] = min(get(r, rx, x, lx), get(r, rx, lx, x));
          }
     }
     if(cnt) rep(i,0,sz(cand[r<<1])) dp[r<<1][i].clear();
     if(cnt == 2) rep(i,0,sz(cand[r<<1])) dp[r<<1|1][i].clear();
}

int main(){ IOS();
     cin >> n;
     rep(i,1,n+1) cin >> a[i];
     rep(i,1,n+1){
          cand[i].pb(i);
          for(int j = i; j > 1; j >>= 1) cand[i].pb(j>>1), cand[i].pb(j^1);
          sort(all(cand[i]));
          while(sz(cand[i]) && cand[i].back() > n) cand[i].pop_back();
     }
     dfs(1);
     // rep(i,1,n+1){
     //      rep(j,0,sz(cand[i])){
     //           er(i, cand[i][j]);
     //           for(int c: dp[i][j]) cerr << c << ' '; cerr << '\n';
     //      }
     // }
     for(int c: dp[1][0]) cout << c << ' '; 
     return 0;  
}

Compilation message (stderr)

swap.cpp: In function 'void IOS()':
swap.cpp:19:18: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |           freopen("in.in", "r", stdin);
      |           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
swap.cpp:20:18: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |           freopen("out.out", "w", stdout);
      |           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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