Submission #643142

#	Time	Username	Problem	Language	Result	Execution time	Memory
643142		TimDee	Password (RMI18_password)	C++17	10 / 100	5 ms	268 KiB

password

#include <bits/stdc++.h>
using namespace std;

int query(string s);

string guess(int n, int c) {

  if (c==2) {
    string A(n,'a'), B(n,'b');
    int a=query(A),b=query(B);
    string ans;
    int added=0;
    for (int i=a; i>=0; --i) {
      string s;
      for (int j=0; j<i; ++j) s+='a';
      for (int j=i; j<n; ++j) s+='b';
      int x=query(s);
      for (int j=0; j<x-added-i; ++j) ans+='b';
      ans+='a';
      added=x-i;
    }
    ans.pop_back();
    reverse(ans.begin(), ans.end());
    return ans;
  }
  if (c==3) {
    string A(n,'a'), B(n,'b'), C(n,'c');
    int a=query(A),b=query(B),c=query(C);
    string ans;
    int addedb=0,addedc=0;
    for (int i=a; i>=0; --i) {
      string s;
      for (int j=0; j<i; ++j) s+='a';
      for (int j=i; j<n; ++j) s+='b';
      int x=query(s)-i-addedb;
      s.clear();
      for (int j=0; j<i; ++j) s+='a';
      for (int j=i; j<n; ++j) s+='c';
      int y=query(s)-i-addedc;
      
      string tmp(i,'a');
      int added=0;
    if (y) {
      for (int j=x; j>=0; --j) {
        string s=tmp;
        for (int k=0; k<j; ++k) s+='b';
        for (int k=0; k<y; ++k) s+='c';
        int v=query(s)-i-j-added;
        for (int k=0; k<v; ++k) {
          ans+='c'; addedc++; added++;
        }
        ans+='b';
        addedb++;
      } 
      if (ans.size()) {ans.pop_back(); --addedb;}
    }
      else for(int k=0; k<x; ++k) {ans+='b'; addedb++;}
      
      ans.push_back('a');
    }
    if (ans.size()) ans.pop_back();
    reverse(ans.begin(), ans.end());
    return ans;
  }

  if (c==4) {
    string A(n,'a'), B(n,'b'), C(n,'c'), D(n,'d');
    int a=query(A),b=query(B),c=query(C),d=query(D);
    string ans;
    int addedb=0,addedc=0,addedd=0;
    for (int i=a; i>=0; --i) {
      string s;
      for (int j=0; j<i; ++j) s+='a';
      for (int j=i; j<n; ++j) s+='b';
      int x=query(s)-i-addedb;
      s.clear();
      for (int j=0; j<i; ++j) s+='a';
      for (int j=i; j<n; ++j) s+='c';
      int y=query(s)-i-addedc;
      s.clear();
      for (int j=0; j<i; ++j) s+='a';
      for (int j=i; j<n; ++j) s+='d';
      int z=query(s)-i-addedd;
      
      string tmp(i,'a');
      
      //cout<<"! "<<x<<' '<<y<<' '<<z<<'\n';
      int addedcnow=0, addeddnow=0;
      for (int j=x; j>=0; --j) {
        //cout<<": "<<ans<<'\n';
        string tmp2(j,'b');
        string s=tmp+tmp2;
        for (int k=0; k<y; ++k) s+='c';
        int p=s.size()?(query(s)-i-j-addedcnow):0;
        s=tmp+tmp2;
        for (int k=0; k<z; ++k) s+='d';
        int q=s.size()?(query(s)-i-j-addeddnow):0;
        
        //cout<<"~ "<<p<<' '<<q<<'\n';
        int added=0;
        for (int k=p; k>=0; --k) {
          string s=tmp+tmp2;
          for (int l=0; l<k; ++l) s+='c';
          for (int l=0; l<q; ++l) s+='d';
          int v=s.size()?(query(s)-i-j-k-added):0;
          for (int l=0; l<v; ++l) {
            ++addedd; ans+='d'; ++added; ++addeddnow;
          }
          ans+='c'; ++addedc; ++addedcnow;
        }
        ans.pop_back(); --addedc; --addedcnow;
        ans+='b'; ++addedb;
      }
      ans.pop_back(); --addedb;

      ans.push_back('a');
    }
    if (ans.size()) ans.pop_back();
    reverse(ans.begin(), ans.end());
    return ans;
  }

  if (n<=c && c<=26) {
    string ans(n,'.');
    for (char i='a'; i<'a'+c; ++i) {
      int x=0;
      for (char j='a'; j<'a'+c; ++j) {
        if (j==i) continue;
        string s;
        s+=i; s+=j;
        int q=query(s);
        x+=q-1;
      }
      if (x<0) continue;
      ans[n-1-x]=i;
    }
    int paiu=1;
    for (auto x:ans) paiu&=x!='.';
    if (paiu) return ans;
  }
  return "abc";
}

Compilation message (stderr)

password.cpp: In function 'std::string guess(int, int)':
password.cpp:10:20: warning: unused variable 'b' [-Wunused-variable]
   10 |     int a=query(A),b=query(B);
      |                    ^
password.cpp:28:20: warning: unused variable 'b' [-Wunused-variable]
   28 |     int a=query(A),b=query(B),c=query(C);
      |                    ^
password.cpp:28:31: warning: unused variable 'c' [-Wunused-variable]
   28 |     int a=query(A),b=query(B),c=query(C);
      |                               ^
password.cpp:68:20: warning: unused variable 'b' [-Wunused-variable]
   68 |     int a=query(A),b=query(B),c=query(C),d=query(D);
      |                    ^
password.cpp:68:31: warning: unused variable 'c' [-Wunused-variable]
   68 |     int a=query(A),b=query(B),c=query(C),d=query(D);
      |                               ^
password.cpp:68:42: warning: unused variable 'd' [-Wunused-variable]
   68 |     int a=query(A),b=query(B),c=query(C),d=query(D);
      |                                          ^

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20