Submission #555462

#	Time	Username	Problem	Language	Result	Execution time	Memory
555462		Sharky	Type Printer (IOI08_printer)	C++17	100 / 100	91 ms	49340 KiB

printer

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int maxn = 25000 * 20 + 5;
int cnt = 0, nex[maxn][26], n;
vector<bool> flag(maxn, false), bac(maxn, false);
vector<char> ans;
void ins(string& s, bool f) {
    int p = 0;
    for (int i = 0; i < s.length(); i++) {
        int c = s[i] - 'a';
        if (!nex[p][c]) {
            nex[p][c] = ++cnt;
        }
        p = nex[p][c];
        flag[p] = f; 
        if (i == s.length() - 1) bac[p] = true; 
    }
}
void dfs(int u) {
    if (bac[u]) ans.pb('P');
    if (flag[u]) {
        for (int i = 0; i < 26; i++) {
            if (!flag[nex[u][i]] && nex[u][i]) ans.pb((char) (i + 'a')), dfs(nex[u][i]), ans.pb('-');
        }
        for (int i = 0; i < 26; i++) {
            if (flag[nex[u][i]] && nex[u][i]) ans.pb((char) (i + 'a')), dfs(nex[u][i]), ans.pb('-');
        }
    } else {
        for (int i = 0; i < 26; i++) {
            if (nex[u][i]) ans.pb((char) (i + 'a')), dfs(nex[u][i]), ans.pb('-');
        }
    }
}
signed main() {
    ios::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    string mx = "";
    vector<string> vs; 
    while (n--) {
        string s; cin >> s; vs.pb(s);
        if (s.length() > mx.length() || (s.length() == mx.length() && s > mx)) mx = s;
    }
    for (auto& s : vs) if (s != mx) ins(s, false);
    ins(mx, true); 
    flag[0] = true; 
    dfs(0);
    while (ans.back() == '-') ans.pop_back();
    cout << ans.size() << "\n";
    for (char c : ans) cout << c << "\n";
    return 0;
}

Compilation message (stderr)

printer.cpp: In function 'void ins(std::string&, bool)':
printer.cpp:10:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for (int i = 0; i < s.length(); i++) {
      |                     ~~^~~~~~~~~~~~
printer.cpp:17:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         if (i == s.length() - 1) bac[p] = true;
      |             ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10