Submission #261244

#	Time	Username	Problem	Language	Result	Execution time	Memory
261244		A02	Gondola (IOI14_gondola)	C++14	20 / 100	17 ms	2560 KiB

gondola

#include "gondola.h"
#include <algorithm>
#include <set>
#include <iostream>
#include <vector>

using namespace std;

int valid(int n, int inputSeq[])
{

    vector<int> occurences (250001, 0);
    vector<int> index (n, -1);


    for (int i = 0; i < n; i++){
        occurences[inputSeq[i]]++;
        if (inputSeq[i] <= n){
            //cout << i << ' ' << reduced_sequence[i] << endl;
            index[inputSeq[i] - 1] = i;
        }
    }

    for (int i = 0; i < occurences.size(); i++){
        if (occurences[i] > 1){
            return 0;
        }
    }

    int lowest_g;
    for (int i = 0; i < n; i++){
        if (index[i] != -1){
            lowest_g = i;
            break;
        }
    }

    for (int i = lowest_g; i < n; i++){
        if (index[i] != -1){
            //cout << i << ' ' << index[i] << endl;
            if ((index[lowest_g] + i - lowest_g) % n != index[i]){
                return 0;
            }
        }
    }

    return 1;
}

//----------------------

int replacement(int n, int gondolaSeq[], int replacementSeq[])
{
  return -2;
}

//----------------------

int countReplacement(int n, int inputSeq[])
{
  return -3;
}

Compilation message (stderr)

gondola.cpp: In function 'int valid(int, int*)':
gondola.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < occurences.size(); i++){
                     ~~^~~~~~~~~~~~~~~~~~~
gondola.cpp:30:9: warning: 'lowest_g' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int lowest_g;
         ^~~~~~~~

• 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