oj.uz

Submission #465976

# Submission time Handle Problem Language Result Execution time Memory
465976 2021-08-17T13:03:21 Z Sench2006 Xor Sort (eJOI20_xorsort) C++14
40 / 100
 77 ms 1004 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() {
    vector <pair<int, int>> ans;
    vector <pair<int, int>> in;
    FOR(i, 1, n + 1) {
        in.push_back({a[i], i});
    }
    sort(rall(in));
    FOR(j, 0, in.size()) {
        int cur = in[j].second;
        FOR(i, 1, n) {
            a[i] ^= a[i + 1];
            ans.push_back(make_pair(i, i + 1));
        }
        if (j) n--;
        FOR(i, cur, n) {
            a[i + 1] ^= a[i];
            ans.push_back(make_pair(i + 1, i));
        }
        FORD(i, cur - 1, 0) {
            a[i] ^= a[i + 1];
            ans.push_back(make_pair(i, i + 1));
        }
        FOR(i, j + 1, in.size()) {
            if (in[i].second > cur) in[i].second--;
        }
    }
    cout << ans.size() << endl;
    FOR(i, 0, ans.size()) {
       cout << ans[i].first << " " << ans[i].second << endl;
    }
}

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();
}

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

    return 0;
}

Compilation message

xorsort.cpp: In function 'void solve1()':
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++)
......
   31 |     FOR(j, 0, in.size()) {
      |         ~~~~~~~~~~~~~~~                 
xorsort.cpp:31:5: note: in expansion of macro 'FOR'
   31 |     FOR(j, 0, in.size()) {
      |     ^~~
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++)
......
   46 |         FOR(i, j + 1, in.size()) {
      |             ~~~~~~~~~~~~~~~~~~~         
xorsort.cpp:46:9: note: in expansion of macro 'FOR'
   46 |         FOR(i, j + 1, in.size()) {
      |         ^~~
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++)
......
   51 |     FOR(i, 0, ans.size()) {
      |         ~~~~~~~~~~~~~~~~                
xorsort.cpp:51:5: note: in expansion of macro 'FOR'
   51 |     FOR(i, 0, ans.size()) {
      |     ^~~
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++)
......
   71 |     FOR(i, 0, ans.size()) {
      |         ~~~~~~~~~~~~~~~~                
xorsort.cpp:71:5: note: in expansion of macro 'FOR'
   71 |     FOR(i, 0, ans.size()) {
      |     ^~~

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Integer 0 violates the range [1, 5]
2 Halted 0 ms 0 KB -

Subtask #2
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Integer 0 violates the range [1, 5]
2 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 344 KB Output is correct
4 Correct 10 ms 460 KB Output is correct
5 Correct 50 ms 848 KB Output is correct
6 Correct 53 ms 836 KB Output is correct
7 Correct 55 ms 860 KB Output is correct
8 Correct 49 ms 844 KB Output is correct
9 Correct 50 ms 880 KB Output is correct
10 Correct 50 ms 808 KB Output is correct
11 Correct 71 ms 804 KB Output is correct
12 Correct 52 ms 864 KB Output is correct
13 Correct 51 ms 812 KB Output is correct
14 Correct 53 ms 936 KB Output is correct
15 Correct 77 ms 1004 KB Output is correct