Submission #722076

#	Time	Username	Problem	Language	Result	Execution time	Memory
722076		nguyentunglam	Password (RMI18_password)	C++17	80 / 100	1180 ms	588 KiB

password

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

const int N = 5010;
int cnt[N];
char a[N], b[N];

int query(string q);

string guess(int n, int s) {
    vector<pair<int, char> > lst;
    for(int j = 0; j < s; j++) {
        char c = j + 'a';
        string ask;
        for(int i = 1; i <= n; i++) ask.push_back(c);
        int tmp = query(ask);
        if (tmp) lst.emplace_back(tmp, c);
    }
    sort(lst.begin(), lst.end());

    int m; char c;
    tie(m, c) = lst[0];
    for(int i = 1; i <= m; i++) a[i] = c;
    lst.erase(lst.begin());

    for(auto &it : lst) {
        int num; char c;
        tie(num, c) = it;
        for(int i = 1; i <= m; i++) {
            string ask;
            for(int j = 1; j <= i; j++) ask.push_back(a[j]);
            cnt[i] = 0;
            while (num > 0) {
                ask.push_back(c);
                string tmp;
                for(int j = i + 1; j <= m; j++) tmp.push_back(a[j]);
                if (query(ask + tmp) > m + cnt[i]) cnt[i]++, num--;
                else break;
            }
        }
        cnt[0] = num;
        int m2 = 0;
        for(int i = 0; i <= m; i++) {
            if (i) b[++m2] = a[i];
            while (cnt[i]--) b[++m2] = c;
        }
        for(int i = 1; i <= m2; i++) a[i] = b[i];
        m = m2;
    }
    string ret;
    for(int i = 1; i <= m; i++) ret.push_back(a[i]);
    return ret;
}

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