Submission #1140198

#	Time	Username	Problem	Language	Result	Execution time	Memory
1140198		liangjeremy	Rabbit Carrot (LMIO19_triusis)	C++20	0 / 100	1096 ms	840 KiB

triusis

#include<bits/stdc++.h>
#include<random>
using namespace std;
using db=double;
using ll=long long;
using sll=__int128;//super long long
using lb=long double;//lb is slow
//numbers for hashing: b(19260817),mod(998244353)
// freopen("lasers.in", "r", stdin);
// freopen("lasers.out", "w", stdout);

class BinaryIndexedTree{
    private:
        vector<int>bit;
    public:
        BinaryIndexedTree(int n){
            bit.resize(n+1);
        }
        void update(int index, int delta){
            while(bit.size()>index){
                bit[index]=min(bit[index],delta); index+=index&-index;
            }
        } 
        int query(int index){
            int mx=1e9;
            while(index>0){
                mx=min(mx,bit[index]); index-=index&-index;
            }
            return mx;
        }
};

int main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n,m; cin>>n>>m; vector<int>a(n+1); map<int,vector<int>>mp;
    for(int i=1; i<=n; i++){
        cin>>a[i]; a[i]-=i*m; mp[a[i]].push_back(i);
    }
    mp[a[0]].push_back(0); vector<int>b(n+1); int count=n+1;
    for(auto x:mp){
        count--;
        for(auto y:x.second){
            b[y]=count;
        }
    }
    BinaryIndexedTree BIT(n+1); vector<int>dp(n+1); int start=1;
    while(a[start]-m>a[start-1] && start<=n){
        a[start]=a[start-1]; start++;
    }
    for(int i=start; i<=n; i++){
        dp[i]=i-1+BIT.query(b[i]);
        BIT.update(b[i],dp[i]-i);
    }
    cout<<dp[n]+start-1<<'\n';
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37