Submission #1138669

#	Time	Username	Problem	Language	Result	Execution time	Memory
1138669		LCJLY	Studentsko (COCI14_studentsko)	C++20	0 / 100	59 ms	131072 KiB

studentsko

#include <bits/stdc++.h>
using namespace std;
 
#define int long long 
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<int,int>pii;
typedef pair<int,pii>pi2;
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

int n,k;
int arr[5005];
int pre[5005];
int suf[5005];
int arr2[5005];
int memo[5005][5005];

int dp(int l, int r){
	if(l==r) return 0;
	if(memo[l][r]!=-1) return memo[l][r];
	int ans=1e15;
	int cost=(r>pre[l]);
	int cost2=(l<suf[r]);
	ans=min(ans,dp(l+1,r)+cost);
	ans=min(ans,dp(l,r-1)+cost2);
	return memo[l][r]=ans;
}

void solve(){
	cin >> n >> k;
	
	vector<int>v;
	for(int x=0;x<n;x++){
		cin >> arr[x];
		v.push_back(arr[x]);
	}
	
	sort(v.begin(),v.end());
	
	vector<pii>v2;
	for(int x=0;x<n;x++){
		int index=lower_bound(v.begin(),v.end(),arr[x])-v.begin();
		arr[x]=index/k;
		v2.push_back({arr[x],x});
	}
	
	sort(v2.begin(),v2.end());
	
	for(int x=0;x<n;x++){
		arr2[v2[x].second]=x;
	}
	
	vector<int>stk;
	for(int x=0;x<n;x++){
		while(!stk.empty()&&arr2[stk.back()]<arr2[x]) stk.pop_back();
		if(!stk.empty()) pre[arr2[x]]=stk.back();
		else pre[arr2[x]]=n+1;
		stk.push_back(x);
		//cout << pre[x] << " ";
	}
	//cout << "\n";
	
	stk.clear();
	for(int x=n-1;x>=0;x--){
		while(!stk.empty()&&arr2[stk.back()]>arr2[x]) stk.pop_back();
		if(!stk.empty()) suf[arr2[x]]=stk.back();
		else suf[arr2[x]]=0;
		stk.push_back(x);
	}
	
	memset(memo,-1,sizeof(memo));
	cout << dp(0,n-1);
	
}
 
int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	//freopen("in.txt","r",stdin);
	//freopen("in.txt","w",stdout);
	int t=1;	
	//cin >> t;	
	while(t--){
		solve(); 
	}
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10