Submission #317096

#	Time	Username	Problem	Language	Result	Execution time	Memory
317096		casperwang	Hidden Sequence (info1cup18_hidden)	C++14	54 / 100	9 ms	376 KiB

hidden

#include <bits/stdc++.h>
#include "grader.h"
#define pb push_back
using namespace std;

vector <int> findSequence (int N) {
  vector <int> G, T;
  int cnt0, cnt1;
  for (int i = 1; i <= N/2+1; i++) {
    G.pb(0);
    if (!isSubsequence(G)) {
      cnt0 = i-1, cnt1 = N-(i-1);
      break;
    }
  }
  G.clear();
  for (int i = 1; i <= N/2+1; i++) {
    G.pb(1);
    if (!isSubsequence(G)) {
      cnt1 = i-1, cnt0 = N-(i-1);
      break;
    }
  }
  int o = (cnt1 < cnt0), len = min(cnt1, cnt0);
  if (len == N) {
    G.clear();
    for (int i = 0; i < N; i++) G.pb(o);
    return G;
  }
  vector <int> p(len+1);
  for (int i = 0; i <= len; i++) {
    for (int j = 1; j <= N-len; j++) {
      G.clear();
      for (int k = 0; k < i; k++) G.pb(o);
      for (int k = 0; k < j; k++) G.pb(!o);
      for (int k = 0; k < len-i; k++) G.pb(o);
      if (!isSubsequence(G)) {
        p[i] = j-1;
        break;
      } else if (j == N-len) {
        p[i] = j;
      }
    }
  }
  G.clear();
  for (int i = 0; i <= len; i++) {
    if (i) G.pb(o);
    for (int j = 0; j < p[i]; j++) G.pb(!o);
  }
  return G;
}

Compilation message (stderr)

hidden.cpp: In function 'std::vector<int> findSequence(int)':
hidden.cpp:8:13: warning: 'cnt1' may be used uninitialized in this function [-Wmaybe-uninitialized]
    8 |   int cnt0, cnt1;
      |             ^~~~
hidden.cpp:8:7: warning: 'cnt0' may be used uninitialized in this function [-Wmaybe-uninitialized]
    8 |   int cnt0, cnt1;
      |       ^~~~
grader.cpp: In function 'int main()':
grader.cpp:28:26: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
   28 |     fprintf (fifo_out, "%d\n", ans.size ());
      |                         ~^     ~~~~~~~~~~~
      |                          |              |
      |                          int            std::vector<int>::size_type {aka long unsigned int}
      |                         %ld
grader.cpp:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (int i=0; i<ans.size () && i < N; i++)
      |                   ~^~~~~~~~~~~~

• Subtask 1: 10 / 20
• Subtask 2: 44 / 80