Submission #923623

#	Time	Username	Problem	Language	Result	Execution time	Memory
923623		shenfe1	Hidden Sequence (info1cup18_hidden)	C++17	100 / 100	5 ms	696 KiB

hidden

#include <bits/stdc++.h>
#include "grader.h"
 
#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")
 
using namespace std;
 
#define pb push_back

vector<int> findSequence(int n){
  int L=(n/2)+1;
  int c1=-1,c0=-1;
  for(int i=1;i<=L;i++){
    vector<int> v;
    for(int j=1;j<=i;j++)v.pb(1);
    if(!isSubsequence(v)){
      c1=i-1;
      c0=n-c1;
      break;
    }
  }
  for(int i=1;i<=L;i++){
    vector<int> v;
    for(int j=1;j<=i;j++)v.pb(0);
    if(!isSubsequence(v)){
      c0=i-1;
      c1=n-c0;
      break;
    }
  }
  vector<int> ans;
  if(c1<=0){
    for(int i=1;i<=n;i++)ans.pb(0);
    return ans;
  }
  if(c0<=0){
    for(int i=1;i<=n;i++)ans.pb(1);
    return ans;
  }
  int cnt0=0,cnt1=0;
  for(int i=1;i<=n;i++){
    if(!c1){
      ans.pb(0);
      c0--;
      continue;
    }
    if(!c0){
      ans.pb(1);
      c1--;
      continue;
    }
    vector<int> v;
    if(cnt0+c1<=cnt1+c0){
      for(int i=1;i<=cnt0;i++)v.pb(0);
      v.pb(0);
      for(int i=1;i<=c1;i++)v.pb(1);
      if(isSubsequence(v)){
        ans.pb(0);
        cnt0++;
        c0--;
      }
      else{
        ans.pb(1);
        cnt1++;
        c1--;
      }
    }
    else{
      for(int i=1;i<=cnt1;i++)v.pb(1);
      v.pb(1);
      for(int i=1;i<=c0;i++)v.pb(0);
      if(!isSubsequence(v)){
        ans.pb(0);
        cnt0++;
        c0--;
      }
      else{
        ans.pb(1);
        cnt1++;
        c1--;
      }
    }
  }
  assert(c0+c1==0);
  return ans;
}

Compilation message (stderr)

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: 20 / 20
• Subtask 2: 80 / 80