oj.uz

Submission #709139

# Submission time Handle Problem Language Result Execution time Memory
709139 2023-03-13T06:40:21 Z zaneyu Password (RMI18_password) C++14
50 / 100
 441 ms 668 KB 
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using ld=long double;
using pii=pair<int,int>;
#define f first
#define s second
#define pb push_back
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define FILL(n,x) memset(n,x,sizeof(n))
#define ALL(_a) _a.begin(),_a.end()
#define sz(x) (int)x.size()
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()),c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
const ll maxn=500+5;
const ll maxlg=__lg(maxn)+2;
const ll INF64=4e18;
const int INF=0x3f3f3f3f;
const ll MOD=1e8+7;
const ld PI=acos(-1);
const ld eps=1e-4;
#define lowb(x) x&(-x)
#define MNTO(x,y) x=min(x,(__typeof__(x))y)
#define MXTO(x,y) x=max(x,(__typeof__(x))y)
int cnt[26];
int query(string str);
int N,S;
vector<int> ord;
string rec(string pf,string sf,int cur){
	//cout<<pf<<' '<<sf<<' '<<cur<<'\n';
	bool hv=0;
	for(int i=cur;i<S;i++){
		string z=pf;
		z.pb(ord[i]+'a');
		z+=sf;
		if(sz(z)<=N and query(z)==sz(z)){
			hv=1;
			cur=i;
			break;
		}
	}
	if(!hv){
		//cout<<"NO\n";
		return "";
	}
	int mx=cnt[cur];
	for(auto x:pf) if(x-'a'==ord[cur]) --mx; 
	for(auto x:sf) if(x-'a'==ord[cur]) --mx; 
	int a=1,b=mx+1;
	while(a<b){
		int m=(a+b+1)/2;
		string z=pf;
		REP(j,m) z.pb(ord[cur]+'a');
		z+=sf;
		if(sz(z)<=N and query(z)==sz(z)) a=m;
		else b=m-1;
	}
	string ans="";
	REP(x,a+1){
		string z;
		REP(y,a-x) z.pb(ord[cur]+'a');
		z+=sf;
		string tmp=rec(pf+ans,z,cur+1);
		ans+=tmp;
		ans.pb(ord[cur]+'a');
	}
	ans.pop_back();
	//cout<<pf<<' '<<sf<<' '<<cur;
	//cout<<"RETURNED: "<<ans<<'\n';
	return ans;
}
mt19937 rng(429);
string guess(int n, int s){
	REP(i,s) ord.pb(i);
	shuffle(ALL(ord),rng);
	REP(i,s){
		string z="";
		REP(a,n) z.pb(ord[i]+'a');
		cnt[i]=query(z);
	}
	N=n,S=s;
	return rec("","",0);
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 208 KB Guessed the password with 131 queries.
2 Correct 3 ms 208 KB Guessed the password with 313 queries.

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Guessed the password with 73 queries.
2 Correct 2 ms 208 KB Guessed the password with 127 queries.
3 Correct 1 ms 208 KB Guessed the password with 18 queries.
4 Correct 3 ms 300 KB Guessed the password with 271 queries.

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 404 KB Guessed the password with 7982 queries.
2 Correct 128 ms 668 KB Guessed the password with 11455 queries.
3 Correct 158 ms 436 KB Guessed the password with 17874 queries.
4 Correct 171 ms 560 KB Guessed the password with 25407 queries.

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 208 KB Guessed the password with 131 queries.
2 Correct 3 ms 208 KB Guessed the password with 313 queries.
3 Correct 1 ms 208 KB Guessed the password with 73 queries.
4 Correct 2 ms 208 KB Guessed the password with 127 queries.
5 Correct 1 ms 208 KB Guessed the password with 18 queries.
6 Correct 3 ms 300 KB Guessed the password with 271 queries.
7 Correct 79 ms 404 KB Guessed the password with 7982 queries.
8 Correct 128 ms 668 KB Guessed the password with 11455 queries.
9 Correct 158 ms 436 KB Guessed the password with 17874 queries.
10 Correct 171 ms 560 KB Guessed the password with 25407 queries.
11 Incorrect 441 ms 580 KB Could not guess the password with 50000 queries.
12 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 208 KB Guessed the password with 131 queries.
2 Correct 3 ms 208 KB Guessed the password with 313 queries.
3 Correct 1 ms 208 KB Guessed the password with 73 queries.
4 Correct 2 ms 208 KB Guessed the password with 127 queries.
5 Correct 1 ms 208 KB Guessed the password with 18 queries.
6 Correct 3 ms 300 KB Guessed the password with 271 queries.
7 Correct 79 ms 404 KB Guessed the password with 7982 queries.
8 Correct 128 ms 668 KB Guessed the password with 11455 queries.
9 Correct 158 ms 436 KB Guessed the password with 17874 queries.
10 Correct 171 ms 560 KB Guessed the password with 25407 queries.
11 Incorrect 441 ms 580 KB Could not guess the password with 50000 queries.
12 Halted 0 ms 0 KB -