Submission #541584

#	Time	Username	Problem	Language	Result	Execution time	Memory
541584		UncoolAnon	Lottery (CEOI18_lot)	C++14	0 / 100	3 ms	596 KiB

lot

#include <bits/stdc++.h>
using namespace std; 
void print(vector<int> a){
	for(int x:a) cout << x << " "; 
	cout<<endl ; 
}
int main(){
	#ifndef ONLINE_JUDGE
		freopen("in.txt","r",stdin); 
		freopen("out.txt","w",stdout); 
	#endif 
	ios_base::sync_with_stdio(0); 
	cin.tie(nullptr); 
	int n,l,q; 
	cin>>n>>l; 
	vector<int> a(n); 
	for(int&x:a) cin>>x; 
	cin>>q; 
	vector<vector<int>> answer(q,vector<int>(n-l+1)); 
	vector<int> m(q); 
	for(int&x:m) cin>>x;
	vector<int> dif(n-l+1); 
	for(int i=0;i+l-1<n;i++){
		if(i==0){
			for(int j=0;j+l-1<n;j++){
				int d=0; 
				for(int k=j;k<j+l;k++) d+=(a[k]!=a[i+k-j]); 
				dif[j]=d; 
			}
		}
		else{
			for(int j=n-1;j>0;j--){
				if(j+l-1<n){
					dif[j]=dif[j-1]-(a[j-1]!=a[i-1]);
					dif[j]+=(a[j+l-1]!=a[i+l-1]); 
				}
			}
			dif[0]=0;
			for(int j=0;j<l;j++)
				dif[0]+=(a[i+j]!=a[j]); 
		}
		//cout << i << " :" ; print(dif); 
		vector<int> prefix(n+1); 
		for(int&x:dif) prefix[x]++; 
		for(int i=1;i<=n;i++) prefix[i]+=prefix[i-1]; 
		for(int query=0;query<q;query++)
			answer[query][i]=prefix[m[query]]-1; 
	}
	for(auto x:answer){
		for(int y:x) cout<<y<<" ";
		cout<<'\n'; 
	}
	return 0; 
}

Compilation message (stderr)

lot.cpp: In function 'int main()':
lot.cpp:9:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |   freopen("in.txt","r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~
lot.cpp:10:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |   freopen("out.txt","w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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