Submission #858946

#	Time	Username	Problem	Language	Result	Execution time	Memory
858946		ntkphong	Type Printer (IOI08_printer)	C++14	70 / 100	119 ms	57528 KiB

printer

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

struct node {
    int w_count;
    int child[26];
};

int n;
vector<node> tree;
vector<int> h, mark;
vector<char> answer;
int id_max;

void new_node() {
    node x;
    x.w_count = 0;
    for(int i = 0; i < 26; i ++) x.child[i] = -1;
    tree.push_back(x);
}

void init() {
    new_node();
}

void add(string s) {
    int idx = 0;
    for(int i = 0; i < s.size(); i ++) {
        int w = s[i] - 'a';
        if(tree[idx].child[w] == -1) {
            new_node();
            tree[idx].child[w] = tree.size() - 1;
        }
        idx = tree[idx].child[w];
    }
    tree[idx].w_count ++ ;
}

void dfs(int u, int par) {
    vector<int> g;
    
    for(int i = 0; i < 26; i ++) {
        int v = tree[u].child[i];
        if(v == -1) continue ;
        g.push_back(v);
    }
    
    if(g.size() > 1) {
        h[u] = 0;
    }
    
    if(g.size() == 0 || g.size() == 1) {
        h[u] = max(1, h[par] + 1);
    }
    
    if(g.size() == 0) {
        if(h[u] > h[id_max]) {
            id_max = u;
        }
    }
    
    for(int v : g) {
        dfs(v, u);
    }
}

void DFS(int u) {
    if(u == id_max) {
        mark[u] = 1;
        return ;
    }
    
    for(int i = 0; i < 26; i ++) {
        int v = tree[u].child[i];
        if(v == -1) continue ;
        DFS(v);
        
        mark[u] = (mark[u] || mark[v]);
    }
}

void _dfs(int u) {
    for(int i = 1; i <= tree[u].w_count; i ++) answer.push_back('P');
    if(u == id_max) {
        cout << answer.size() << "\n";
        for(auto c : answer) cout << c << "\n";
    
        exit(0);
    }
    
    for(int i = 0; i < 26; i ++) {
        int v = tree[u].child[i];
        if(v == -1) continue ;
        if(!mark[v]) {
            answer.push_back((char)(i + 'a'));
            _dfs(v);
            answer.push_back('-');
        }
    }
    
    for(int i = 0; i < 26; i ++) {
        int v = tree[u].child[i];
        if(v == -1) continue ;
        if(mark[v]) {
            answer.push_back((char)(i + 'a'));
            _dfs(v);
            answer.push_back('-');
        }
    }
}

int main() {
#define taskname ""

    if(fopen(taskname".inp", "r")) {
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }

    cin.tie(0)->sync_with_stdio(0);
    
    cin >> n;
    init();
    
    for(int i = 1; i <= n; i ++) {
        string s;
        cin >> s;
        add(s);
    }
    
    h.resize(tree.size());
    mark.resize(tree.size());
    
    dfs(0, 0);
    DFS(0);
    
    _dfs(0);
    return 0;
}
 

Compilation message (stderr)

printer.cpp: In function 'void add(std::string)':
printer.cpp:28:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for(int i = 0; i < s.size(); i ++) {
      |                    ~~^~~~~~~~~~
printer.cpp: In function 'int main()':
printer.cpp:116:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  116 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
printer.cpp:117:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  117 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10