Submission #701936

#	Time	Username	Problem	Language	Result	Execution time	Memory
701936		PCTprobability	Gondola (IOI14_gondola)	C++17	20 / 100	28 ms	4668 KiB

gondola

#include <bits/stdc++.h>
#include "gondola.h"
using namespace std;
using ll = long long;
int valid(int n, int inputSeq[]){
  for(int i=0;i<n;i++) inputSeq[i]--;
  set<int> s;
  for(int i=0;i<n;i++) s.insert(inputSeq[i]);
  if(s.size()!=n) return 0;
  for(int i=0;i<n;i++){
    if(inputSeq[i]<n){
      for(int j=0;j<n;j++){
        if(inputSeq[(i+j)%n]<n&&inputSeq[(i+j)%n]!=(inputSeq[i]+j)%n) return 0;
      }
      return 1;
    }
  }
  return 1;
}
int replacement(int n, int gondolaSeq[], int replacementSeq[]){
  for(int i=0;i<n;i++) gondolaSeq[i]--;
  int m=0;
  for(int i=0;i<n;i++) m=max(m,gondolaSeq[i]);
  if(m==n-1){
    return 0;
  }
  int m2=500000;
  for(int i=0;i<n;i++) m2=min(m2,gondolaSeq[i]);
  if(m2>=n){
    vector<int> rev(500000,-1);
    for(int i=0;i<n;i++) rev[gondolaSeq[i]]=i;
    set<int> idx;
    for(int i=0;i<n;i++){
      if(gondolaSeq[i]>=n) idx.insert(i);
    }
    for(int i=n;i<=m;i++){
      if(rev[i]==-1){
        int id=(*idx.begin());
        replacementSeq[i-n]=gondolaSeq[id]+1;
        gondolaSeq[id]=i;
      }
      else{
        replacementSeq[i-n]=gondolaSeq[rev[i]]+1;
        idx.erase(rev[i]);
        gondolaSeq[rev[i]]=i;
      }
    }
    return m-n+1;
  }
  return 0;
}
int countReplacement(int n, int inputSeq[]){
  return 0;
}

Compilation message (stderr)

gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:9:14: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    9 |   if(s.size()!=n) return 0;
      |      ~~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 0 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 20
• Subtask 7: 0 / 5
• Subtask 8: 0 / 15
• Subtask 9: 0 / 15
• Subtask 10: 0 / 10