oj.uz

Submission #465975

# Submission time Handle Problem Language Result Execution time Memory
465975 2021-08-17T13:02:37 Z Sench2006 Xor Sort (eJOI20_xorsort) C++14
40 / 100
 67 ms 972 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;
    int x = n;
    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()) {
      |     ^~~
xorsort.cpp: In function 'void solve()':
xorsort.cpp:78:9: warning: unused variable 'x' [-Wunused-variable]
   78 |     int x = n;
      |         ^

Subtask #1
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 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 0 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 0 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 456 KB Output is correct
5 Correct 51 ms 848 KB Output is correct
6 Correct 50 ms 840 KB Output is correct
7 Correct 52 ms 840 KB Output is correct
8 Correct 51 ms 876 KB Output is correct
9 Correct 51 ms 840 KB Output is correct
10 Correct 50 ms 960 KB Output is correct
11 Correct 51 ms 832 KB Output is correct
12 Correct 56 ms 928 KB Output is correct
13 Correct 61 ms 916 KB Output is correct
14 Correct 52 ms 872 KB Output is correct
15 Correct 67 ms 972 KB Output is correct