Submission #635643

#	Time	Username	Problem	Language	Result	Execution time	Memory
635643		welleyth	Abracadabra (CEOI22_abracadabra)	C++17	0 / 100	495 ms	54564 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

//#define int long long
#define mp make_pair
#define pb push_back

using namespace std;
using namespace __gnu_pbds;
mt19937 rnd(time(nullptr));

constexpr int N = (int)1e6 + 111;
constexpr int INF = (int)1e9 + 111;

int T[4*N];
int w[4*N];
void push(int v,int l,int r){
    if(w[v] == 0)
        return;
    int m = (l+r)>>1;
    T[v<<1] += w[v];
    T[v<<1|1] += w[v];
    w[v<<1] += w[v];
    w[v<<1|1] += w[v];
    w[v] = 0;
    return;
}
void upd(int v,int l,int r,int tl,int tr,int x){
    if(l > r || tl > tr){
        return;
    }
    if(l == tl && r == tr){
        T[v] += x;
        w[v] += x;
        return;
    }
    push(v,l,r);
    int m = (l+r)>>1;
    upd(v<<1,l,m,tl,min(tr,m),x);
    upd(v<<1|1,m+1,r,max(tl,m+1),tr,x);
    T[v] = min(T[v<<1],T[v<<1|1]);
    return;
}
int n,q;
void upd(int l,int r,int x){
    upd(1,1,n,l,r,x);
    return;
}
int get(int v,int l,int r,int tl,int tr){
    if(l > r || tl > tr)
        return INF;
    if(l == tl && r == tr)
        return T[v];
    push(v,l,r);
    int m = (l+r)>>1;
    return min(get(v<<1,l,m,tl,min(tr,m)),get(v<<1|1,m+1,r,max(m+1,tl),tr));
}

int get(int l,int r){
    return get(1,1,n,l,r);
}

int getPos(int v,int l,int r,int x){ /// get a[pos] <= x
    if(l > r)
        return -1;
    if(l == r)
        return l;
    int m = (l+r)>>1;
    push(v,l,r);
    if(T[v<<1] <= x)
        return getPos(v<<1,l,m,x);
    else
        return getPos(v<<1|1,m+1,r,x);
}

int getSuff(int r){
    return get(r,r);
}

int a[N];
int t[N],P[N];

set<int> st;
int parent[N];
vector<pair<int,pair<int,int>>> Q;
int ans[N];
int len[N];

void __attribute__ (( optimize("Ofast","unroll-loops"), target("avx2") )) solve(){
    n = (int)10000, q = (int)10000;
    for(int i = 0; i <= n; i++) T[i] = 0;
    st.clear();
    Q.clear();
//    cin >> n >> q;
    scanf("%d %d",&n,&q);
    int rv[n+1];
    for(int i = 0; i < n; i++){
        cin >> a[i];
        rv[a[i]] = i;
    }
    int nxt[n+1];
    vector<pair<int,int>> RightBiggest;
    for(int i = n-1; i >= 0; i--){
        while(!RightBiggest.empty() && RightBiggest.back().first < a[i])
            RightBiggest.pop_back();
        if(!RightBiggest.empty())
            nxt[i] = RightBiggest.back().second;
        else
            nxt[i] = n;
        RightBiggest.pb(mp(a[i],i));
    }
    for(int i = 0; i < q; i++){
//        cin >> t[i] >> P[i];
        scanf("%d %d",&t[i],&P[i]);
        Q.pb(mp(t[i],mp(P[i],i)));
    }
    sort(Q.begin(),Q.end());
    vector<pair<int,int>> v;
    bool used[n+1];
    for(int i = 0; i <= n; i++){
        used[i] = false;
    }
    for(int i = 0; i < n; i++){
        if(used[i])
            continue;
        int __r = nxt[i];
        if(i < n/2)
            __r = min(__r,n/2);
        for(int j = i; j < __r; j++) used[j] = 1;
        st.insert(a[i]);
        len[a[i]] = __r - i;
        upd(1,a[i],__r-i);
    }
    int cur_t = 1;
    bool all = false;
    for(auto& query : Q){
        int& t = query.first;
        int& pos = query.second.first;
        int& id = query.second.second;
        if(t == 0){
            ans[id] = a[pos-1];
            continue;
        }
        while(!all && cur_t < t){
            int y = getPos(1,1,n,n/2);
            auto it = st.lower_bound(y);
            it--;
            int x = *it;
            int tr = getSuff(y);
            if(n/2 - tr <= 0){
                all = true;
                break;
            }
            int delta = n/2 - tr;
            int __len = len[x];
            int __pos = rv[x] + __len - delta;
            upd(1,x,-delta);
            len[x] -= delta;
            while(__pos < rv[x] + __len){
                int __r = min(nxt[__pos],rv[x] + __len);
                st.insert(a[__pos]);
                upd(1,a[__pos],__r-__pos);
                len[a[__pos]] = __r - __pos;
                __pos = __r;
            }
            cur_t++;
        }
        int x = getPos(1,1,n,n-pos);
        auto it = st.lower_bound(x);
        it--;
        if(get(x,x) <= n-pos){
            x = *it;
        }
        int sz = len[x];
        int suffSum = 0;
        it = st.lower_bound(x);
        it++;
        if(it != st.end()){
            int y = *it;
            suffSum = getSuff(y);
        }
        int cur_pos = (n - pos + 1) - suffSum;
        cur_pos = sz - cur_pos;
        int __pos = rv[x];
        ans[id] = a[__pos + cur_pos];
    }
    for(int i = 0; i < q; i++){
//        cout << ans[i] << "\n";
        printf("%d\n",ans[i]);
    }
    return;
}

signed main(){
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int tests = 1;
//    cin >> tests;
    for(int test = 1; test <= tests; test++){
        solve();
    }
    return 0;
}
/**
**/

Compilation message (stderr)

Main.cpp: In function 'void push(int, int, int)':
Main.cpp:21:9: warning: unused variable 'm' [-Wunused-variable]
   21 |     int m = (l+r)>>1;
      |         ^
Main.cpp: In function 'void solve()':
Main.cpp:96:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |     scanf("%d %d",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~~
Main.cpp:115:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |         scanf("%d %d",&t[i],&P[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25