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Submission #709136

# Submission time Handle Problem Language Result Execution time Memory
709136 2023-03-13T06:38:14 Z zaneyu Password (RMI18_password) C++14
50 / 100
 344 ms 716 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(423);
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 119 queries.
2 Correct 2 ms 208 KB Guessed the password with 307 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 3 ms 208 KB Guessed the password with 127 queries.
3 Correct 1 ms 208 KB Guessed the password with 18 queries.
4 Correct 4 ms 208 KB Guessed the password with 330 queries.

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 76 ms 512 KB Guessed the password with 7634 queries.
2 Correct 87 ms 520 KB Guessed the password with 11505 queries.
3 Correct 197 ms 568 KB Guessed the password with 18589 queries.
4 Correct 248 ms 588 KB Guessed the password with 24882 queries.

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 208 KB Guessed the password with 119 queries.
2 Correct 2 ms 208 KB Guessed the password with 307 queries.
3 Correct 1 ms 208 KB Guessed the password with 73 queries.
4 Correct 3 ms 208 KB Guessed the password with 127 queries.
5 Correct 1 ms 208 KB Guessed the password with 18 queries.
6 Correct 4 ms 208 KB Guessed the password with 330 queries.
7 Correct 76 ms 512 KB Guessed the password with 7634 queries.
8 Correct 87 ms 520 KB Guessed the password with 11505 queries.
9 Correct 197 ms 568 KB Guessed the password with 18589 queries.
10 Correct 248 ms 588 KB Guessed the password with 24882 queries.
11 Incorrect 344 ms 716 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 119 queries.
2 Correct 2 ms 208 KB Guessed the password with 307 queries.
3 Correct 1 ms 208 KB Guessed the password with 73 queries.
4 Correct 3 ms 208 KB Guessed the password with 127 queries.
5 Correct 1 ms 208 KB Guessed the password with 18 queries.
6 Correct 4 ms 208 KB Guessed the password with 330 queries.
7 Correct 76 ms 512 KB Guessed the password with 7634 queries.
8 Correct 87 ms 520 KB Guessed the password with 11505 queries.
9 Correct 197 ms 568 KB Guessed the password with 18589 queries.
10 Correct 248 ms 588 KB Guessed the password with 24882 queries.
11 Incorrect 344 ms 716 KB Could not guess the password with 50000 queries.
12 Halted 0 ms 0 KB -