oj.uz

Submission #1076847

# Submission time Handle Problem Language Result Execution time Memory
1076847 2024-08-26T17:17:38 Z horiaboeriu Xor Sort (eJOI20_xorsort) C++17
60 / 100
 4 ms 860 KB 
#include <bits/stdc++.h>

using namespace std;
#define MAXN 1000
#define MAX 40000
int v[MAXN], rez1[MAX], rez2[MAX];
int nr;
void calcxor(int i, int j) {
    rez1[nr] = i + 1;
    rez2[nr] = j + 1;
    //in i se face xorul celor doua
    nr++;
}
int main()
{
    int n, s, i, k, ul, x;
    scanf("%d%d", &n, &s);
    for (i = 0; i < n; i++) {
        scanf("%d", &v[i]);
    }
    if (s == 1) {
        //o sa fac o sortare prin selectie care va avea n * (n - 1) / 2 * 2 operatii care este fix sub 40000
        for (i = 0; i < n - 1; i++) {
            calcxor(i, i + 1);
        }
        for (ul = n - 1; ul > 0; ul--) {
            //caut maximul
            k = 0;
            for (i = 1; i <= ul; i++) {
                if (v[i] > v[k]) {
                    k = i;
                }
            }
            //acum pe fiecare poz ar fi v[poz] ^ v[poz + 1], iar pe ultima poz este v[ul]
            for (i = k + 1; i <= ul; i++) {
                calcxor(i, i - 1);
            }
            //acum in pozitiile <= k este v[poz] ^ v[poz + 1] si pe poz, (k < poz < ul) este v[k] ^ v[poz + 1] ca celelalte apar de un numar par de ori si se elimina
            //si pe ultima poz, adica pozitia ul este v[k]

            if (k > 0) {
                calcxor(k - 1, k);
            }
            for (i = k; i < ul; i++) {
                calcxor(i, i + 1);
            }
            //acum in pe fiecare pozitie < k - 1 este v[poz] ^ v[poz + 1], pe poz k - 1 este v[k - 1] ^ v[k + 1]
            //si pe fiecare poz, k < poz < ul - 1 este v[poz + 1] ^ v[poz + 2], pe ul - 1 este v[ul] si pe ul este v[k]
            x = v[k];
            for (i = k + 1; i <= ul; i++) {
                v[i - 1] = v[i];
            }
            v[ul] = x;
            //acum, pentru ca am shiftat la stanga tot de la k, pe fiecare poz este v[poz] ^ v[poz + 1] si pe ul - 1 este v[ul]
            //in v fiind numerele originale
        }
    } else {

    }
    printf("%d\n", nr);
    for (i = 0; i < nr; i++) {
        printf("%d %d\n", rez1[i], rez2[i]);
    }
    return 0;
}

Compilation message

xorsort.cpp: In function 'int main()':
xorsort.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     scanf("%d%d", &n, &s);
      |     ~~~~~^~~~~~~~~~~~~~~~
xorsort.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         scanf("%d", &v[i]);
      |         ~~~~~^~~~~~~~~~~~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 856 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 2 ms 604 KB Output is correct
13 Correct 2 ms 600 KB Output is correct
14 Correct 2 ms 732 KB Output is correct
15 Correct 2 ms 604 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 604 KB Output is correct
6 Correct 1 ms 856 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 2 ms 604 KB Output is correct
13 Correct 2 ms 600 KB Output is correct
14 Correct 2 ms 732 KB Output is correct
15 Correct 2 ms 604 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 2 ms 604 KB Output is correct
19 Correct 2 ms 604 KB Output is correct
20 Correct 2 ms 716 KB Output is correct
21 Correct 2 ms 604 KB Output is correct
22 Correct 2 ms 604 KB Output is correct
23 Correct 2 ms 604 KB Output is correct
24 Correct 2 ms 668 KB Output is correct
25 Correct 2 ms 600 KB Output is correct
26 Correct 4 ms 860 KB Output is correct
27 Correct 4 ms 856 KB Output is correct
28 Correct 4 ms 860 KB Output is correct
29 Correct 4 ms 860 KB Output is correct
30 Correct 4 ms 860 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 348 KB Not sorted
2 Halted 0 ms 0 KB -