Submission #970214

#	Time	Username	Problem	Language	Result	Execution time	Memory
970214		amirhoseinfar1385	The short shank; Redemption (BOI21_prison)	C++17	0 / 100	76 ms	95068 KiB

prison

#include<bits/stdc++.h>
using namespace std;
const int maxn=2000000+10;
long long n,k,t,inf=1e9+5;
int all[maxn],res=0;
vector<pair<int,int>>allq;
set<int>alld[maxn];

void vorod(){
	cin>>n>>k>>t;
	for(int i=1;i<=n;i++){
		cin>>all[i];
	}
}

void calbaz(){
	all[0]=inf;
	vector<int>v;
	v.push_back(0);
	for(int i=1;i<=n;i++){
		while((int)v.size()>0&&all[v.back()]+(i-v.back())>=all[i]){
			v.pop_back();
		}
		while((int)v.size()>0&&all[v.back()]+(i-v.back())>=t){
			v.pop_back();
		}
		if(all[i]>t){
			if((int)v.size()==0){
				res++;
			}else{
				allq.push_back(make_pair(v.back(),i-1));
			}
		}
		v.push_back(i);
	}
}

void aval(){
	for(int i=0;i<allq.size();i++){
		for(int j=allq[i].first;j<=allq[i].second;j++){
			alld[j].insert(i);
		}
	}
}

void pre(){
	calbaz();
	aval();
}

int getmx(){
	int wh=-1,mn=0;
	for(int i=1;i<=n;i++){
		if((int)alld[i].size()>mn){
			mn=(int)alld[i].size();
			wh=i;
		}
	}
	return wh;
}

void remove(int ind){
	if(ind==-1){
		return ;
	}
	res+=(int)alld[ind].size();
	set<int>hey=alld[ind];
	for(auto x:hey){
		for(int j=allq[x].first;j<=allq[x].second;j++){
			alld[j].erase(x);
		}
	}
}

void cal(){
	int ind=getmx();
	remove(ind);
}

void solve(){
	for(int i=0;i<k;i++){
		cal();
	}
}

void khor(){
	res=n-res;
	cout<<res<<"\n";
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	freopen("inp.txt","r",stdin);
	vorod();
	pre();
	solve();
	khor();
}

Compilation message (stderr)

prison.cpp: In function 'void aval()':
prison.cpp:39:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |  for(int i=0;i<allq.size();i++){
      |              ~^~~~~~~~~~~~
prison.cpp: In function 'int main()':
prison.cpp:95:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |  freopen("inp.txt","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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