Submission #755929

#	Time	Username	Problem	Language	Result	Execution time	Memory
755929		vjudge1	Password (RMI18_password)	C++17	80 / 100	757 ms	708 KiB

password

#include<bits/stdc++.h>
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<pair<int, int>, null_type, less<pair<int, int>>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
int dx[8] = {1, 0, 0, -1, 1, 1, -1, -1};
int dy[8] = {0, 1, -1, 0, 1, -1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
////////////////////Only Clear Code//////////////////////////

void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}

const int mx = 1e6+9;
const int LOG = 25;
const ll inf = 1e18;
const ll mod = 1e9+7;

int freq[30];

string pass;
bool subsequence(string a, string b){
    int ind = 0;
    for(int i = 0; i < b.size();i++){
        if(b[i] == a[ind]){
            ind++;
            if(ind == a.size())return 1;
        }
    }
    return 0;
}

int query(string str);

string guess(int n, int s){
    for(int i = 0; i < s;i++){
        freq[i] = 0;
    }
    for(int i = 0; i < s;i++){
        char x = i+'a';
        string c = string(1, x);
        while(c.size() <= n){
            int res = query(c);
            if(res == c.size())freq[i] = c.size();
            else break;
            c += x;
        }
    }
    string c = "";
    for(int i = 0; i < s;i++){
        char x = i+'a';
        if(freq[i] != 0){
            int k = freq[i];
            while(k--){
                c += x;
            }
            freq[i] = 0;
            break;
        }
    }
    for(int j = 0; j < s;j++){
        if(freq[j] == 0)continue;
        string x = string(1, char(j + 'a'));
        string temp = "";
        vi v;
        while(freq[j]--){
            temp += x;
            int l = 0, r = (v.empty() ? c.size() : v.back()+1);
            int ind = c.size();
            while(l <= r){
                int md = (l+r)/2;
                string mat = "";
                for(int i = 0; i < md;i++){
                    mat += c[i];
                }
                string one = mat + temp;
                if(query(one) == one.size()){
                    ind = md;
                    l = md+1;
                }
                else{
                    r = md-1;
                }
            }
            v.pb(ind-1);
        }
        //cout << x << " "  << c << endl;
        int cnt = 0;
        sort(all(v));
        for(int y : v){
            //cout << y << " ";
            c.insert(y+cnt+1,x);
            cnt++;
        }
        //cout << endl;
    }
    return c;
}

/*string guess(int n, int s){
    string c = "";
    for(int i = 0; i < s;i++){
        char x = i + 'a';
        if(query(c + x) != 0){
            c = x;
            break;
        }
    }
    for(int i = 0;c.size() < n && i < s;i++){
        char x = i + 'a';
        //cout << x << endl;
        while(c.size() < n){
            bool ok = 0;
            for(int j = 0;j <= c.size();j++){
                string temp = c;
                temp.insert(j, string(1, x));
                if(query(temp) == temp.size()){
                    c = temp;
                    ok = 1;
                    break;
                    
                }
            }
            if(!ok){
                break;
            }
        }
    }
    return c;
}*/
/*
void run_case(){
    pass = "aeafeddbadcab";
    string s = guess(13, 6);
    cout << s << endl;
    cout << (s == pass ? "YES" : "NO") << endl;
}

int main(){
    init();
    speed;
    int t;
    //cin >> t;
    t = 1;
    while(t--){
        run_case();
    }
}*/

/*
    NEVER GIVE UP!
    DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
    Your Guide when stuck:
    - Continue keyword only after reading the whole input
    - Don't use memset with testcases
    - Check for corner cases(n=1, n=0)
    - Check where you declare n(Be careful of declaring it globally and in main)
*/  

Compilation message (stderr)

password.cpp: In function 'bool subsequence(std::string, std::string)':
password.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for(int i = 0; i < b.size();i++){
      |                    ~~^~~~~~~~~~
password.cpp:55:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |             if(ind == a.size())return 1;
      |                ~~~~^~~~~~~~~~~
password.cpp: In function 'std::string guess(int, int)':
password.cpp:70:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   70 |         while(c.size() <= n){
      |               ~~~~~~~~~^~~~
password.cpp:72:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |             if(res == c.size())freq[i] = c.size();
      |                ~~~~^~~~~~~~~~~
password.cpp:105:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |                 if(query(one) == one.size()){
      |                    ~~~~~~~~~~~^~~~~~~~~~~~~
password.cpp: In function 'void init()':
password.cpp:35:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
password.cpp:37:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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