Submission #476449

#	Time	Username	Problem	Language	Result	Execution time	Memory
476449		chenwz	Type Printer (IOI08_printer)	C++11	100 / 100	108 ms	49356 KiB

printer

#include <bits/stdc++.h>
using namespace std;
const int SIG = 26, NN = 25000;
struct Node {
  int ch[SIG];
  bool mark, end;
} T[NN * 20];
int sz = 0;
void insert(const string &s) {
  int u = 0;
  for (char c : s) {
    int d = c - 'a', &cu = T[u].ch[d];
    if (!cu) cu = ++sz;
    u = cu;
  }
  T[u].end = true;
}
void dfs(int u, string& ans) {
  const Node& x = T[u];
  if (x.end) ans += 'P'; // 单词结尾, 打印
  int mi = -1;
  for (int i = 0; i < SIG; ++i) {
    int v = x.ch[i];
    if(!v) continue;
    if (T[v].mark) mi = i; // 先不走最长的串
    else ans += i + 'a', dfs(v, ans); // 走其它串
  }
  if (mi != -1) // 走最长串
    ans += mi + 'a', dfs(x.ch[mi], ans);
  ans += '-';
}

int main() {  
  char B[24];
  int n; scanf("%d", &n);
  string s, l;  
  for (int i = 0; i < n; ++i) {
    scanf("%s", B), s = string(B), insert(s);
    if (s.length() > l.length()) l = s;
  }
  for(size_t i = 0, u = 0; i < l.size(); i++) // 标记最长的单词
    u = T[u].ch[l[i] - 'a'], T[u].mark = true;
  s.clear(), dfs(0, s);
  while(s.back() == '-') s.pop_back(); // 最后的字符全部删掉
  printf("%lu\n", s.size());
  for (char c : s) printf("%c\n", c);
  return 0;
}

Compilation message (stderr)

printer.cpp: In function 'int main()':
printer.cpp:35:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |   int n; scanf("%d", &n);
      |          ~~~~~^~~~~~~~~~
printer.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |     scanf("%s", B), s = string(B), insert(s);
      |     ~~~~~^~~~~~~~~

• 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