Submission #1123178

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123178		razivo	The short shank; Redemption (BOI21_prison)	C++20	0 / 100	160 ms	8668 KiB

prison

#include <iostream>
#include <queue>
#include <vector>
#include <tuple>
using namespace std;
vector<int> v(2e6);
pair<pair<int,int>,int> opt(int i, int j) {
    int best = 0;
    int bestpos = j-1;
    vector<int> q;
    for (int k = j-1; k >=i; --k) {
        if(v[k]==-1) {
            q.push_back(k);
            continue;
        }
        int p = k+v[k];
        int v = 0;
        while(!q.empty() && q.back()<p) {
            q.pop_back();
            v++;
        }
        if(v>best) {
            best=v;
            bestpos=k;
        }
    }
    return {{q.size(),best},bestpos};
}
int main() {
    int n,d,t; cin>>n>>d>>t;
    for (int i = 0; i < n; ++i) {
        int x; cin>>x;
        if(x>t) v[i]=-1;
        else v[i]=t-x+1;
    }
    priority_queue<pair<int,tuple<int,int,int>>> q;
    auto [a,b] = opt(0,n);
    auto [l,m] = a;
    int init = n-l;
    q.push({m,{b,0,n}});
    for (int i = 0; i < d; ++i) {
        auto [a,b] = q.top(); q.pop();
        auto [p,l,r] = b;
        init-=a;
        auto [u,v] = opt(l,p+1);
        auto [u2,v2] = opt(p+1,r);
        q.push({u.second,{v,l,p+1}});
        q.push({u2.second,{v2,p+1,r}});
    }
    cout<<init<<endl;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 25
• Subtask 6: 0 / 20