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Submission #465957

# Submission time Handle Problem Language Result Execution time Memory
465957 2021-08-17T12:40:55 Z Sench2006 Xor Sort (eJOI20_xorsort) C++14
40 / 100
 69 ms 988 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ar array

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define lb lower_bound
#define ub upper_bound

#define FOR(i, a, b) for(auto i = a; i < b; i++)
#define FORD(i, a, b) for(auto i = a - 1; i >= b; i--)
#define trav(x, v) for(auto x : v)

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

// ---------------------------------------- Solution ---------------------------------------- //

const int N = 1005;
int s, n;
int a[N];

void solve1() {

}

void solve2() {
    vector <pair<int, int>> ans;
    for(int i = 1; i <= (1 << 20); i *= 2) {
        FOR(j, 1, n) {
            if((i&a[j])) {
                if(!(i&a[j + 1])) {
                    ans.push_back({j + 1,j});
                    a[j + 1] ^= a[j];
                }
                ans.push_back({j, j + 1});
                a[j] ^= a[j + 1];
            }
        }
    }
    cout << ans.size() << endl;
    FOR(i, 0, ans.size()) {
       cout << ans[i].first << " " << ans[i].second << endl;
    }
}

void solve() {
    cin >> n >> s;
    FOR(i, 1, n + 1) {
        cin >> a[i];
    }
    // if (s == 1) solve1();
    // else solve2();
    solve2();
}

int main() {
    fastio;
    
    int tests = 1;
    // cin >> tests;
    while (tests--) {
        solve();
    }

    return 0;
}

Compilation message

xorsort.cpp: In function 'void solve2()':
xorsort.cpp:12:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 | #define FOR(i, a, b) for(auto i = a; i < b; i++)
......
   43 |     FOR(i, 0, ans.size()) {
      |         ~~~~~~~~~~~~~~~~                
xorsort.cpp:43:5: note: in expansion of macro 'FOR'
   43 |     FOR(i, 0, ans.size()) {
      |     ^~~

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Incorrect 3 ms 332 KB Not sorted
4 Halted 0 ms 0 KB -

Subtask #2
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Incorrect 3 ms 332 KB Not sorted
4 Halted 0 ms 0 KB -

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 3 ms 332 KB Output is correct
4 Correct 10 ms 464 KB Output is correct
5 Correct 57 ms 988 KB Output is correct
6 Correct 50 ms 884 KB Output is correct
7 Correct 50 ms 800 KB Output is correct
8 Correct 50 ms 904 KB Output is correct
9 Correct 51 ms 892 KB Output is correct
10 Correct 50 ms 804 KB Output is correct
11 Correct 49 ms 820 KB Output is correct
12 Correct 51 ms 912 KB Output is correct
13 Correct 50 ms 824 KB Output is correct
14 Correct 52 ms 840 KB Output is correct
15 Correct 69 ms 980 KB Output is correct