#include<bits/allocator.h>
#pragma GCC optimize("Ofast,unroll-loops")
#ifdef ONLINE_JUDGE
#pragma GCC target("avx2,fma,bmi,bmi2,popcnt,lzcnt")
#endif
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define int128 __int128_t
#define double long double
#define gcd __gcd
#define lcm(a, b) ((a)/gcd(a, b)*(b))
#define sqrt sqrtl
#define log2 log2l
#define log10 log10l
#define floor floorl
#define to_string str
#define yes cout << "YES"
#define no cout << "NO"
#define trav(i, a) for (auto &i: (a))
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define sz(a) (int)a.size()
#define Max(a) *max_element(all(a))
#define Min(a) *min_element(all(a))
#define Find(a, n) (find(all(a), n) - a.begin())
#define Count(a, n) count(all(a), n)
#define Upper(a, n) (upper_bound(all(a), n) - a.begin())
#define Lower(a, n) (lower_bound(all(a), n) - a.begin())
#define next_perm(a) next_permutation(all(a))
#define prev_perm(a) prev_permutation(all(a))
#define sorted(a) is_sorted(all(a))
#define sum(a) accumulate(all(a), 0)
#define sumll(a) accumulate(all(a), 0ll)
#define Sort(a) sort(all(a))
#define Reverse(a) reverse(all(a))
#define Unique(a) Sort(a), (a).resize(unique(all(a)) - a.begin())
#define pb push_back
#define eb emplace_back
#define popcount __builtin_popcount
#define popcountll __builtin_popcountll
#define clz __builtin_clz
#define clzll __buitlin_clzll
#define ctz __builtin_ctz
#define ctzll __builtin_ctzll
#define open(s) freopen(s, "r", stdin)
#define write(s) freopen(s, "w", stdout)
#define fileopen(s) open((string(s) + ".inp").c_str()), write((string(s) + ".out").c_str());
#define For(i, a, b) for (auto i = (a); i < (b); i++)
#define Fore(i, a, b) for (auto i = (a); i >= (b); i--)
#define FOR(i, a, b) for (auto i = (a); i <= (b); i++)
#define ret(s) return void(cout << s);
const int mod = 1e9 + 7, mod2 = 998244353;
const double PI = acos(-1), eps = 1e-9;
const ull npos = string::npos;
const int dx[] = {0, 0, -1, 1}, dy[] = {-1, 1, 0, 0};
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using cd = complex<double>;
mt19937 mt(chrono::system_clock::now().time_since_epoch().count());
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<double> vdo;
typedef vector<vdo> vvdo;
typedef vector<string> vs;
typedef vector<pii> vpair;
typedef vector<vpair> vvpair;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<char> vc;
typedef vector<vc> vvc;
typedef vector<cd> vcd;
typedef priority_queue<int> pq;
typedef priority_queue<int, vi, greater<int>> pqg;
typedef priority_queue<ll> pqll;
typedef priority_queue<ll, vll, greater<ll>> pqgll;
ll add(ll a, ll b, int m) {if (a >= m) a%=m;if (b >= m) b%=m;a+=b;return a >= m ? a - m: a;}
ll sub(ll a, ll b, int m) {if (a >= m) a%=m;if (b >= m) b%=m;a-=b;return a < 0 ? a + m: a;}
ll mul(ll a, ll b, int m) {if (a >= m) a%=m;if (b >= m) b%=m;return a*b % m;}
ll bin_mul(ll a, ll b, ll m) {if (a >= m) a%=m;if (b >= m) b%=m;ll x = 0;while (b) {if (b & 1) x = (x + a) % m;a = (a + a) % m;b>>=1;}return x;}
ll power(ll a, ll b, int m) {ll x = 1;if (a >= m) a%=m; while (b) {if (b & 1) x = x*a % m;a = a*a % m;b>>=1;}return x;}
ll power(ll a, ll b) {ll x = 1;while (b) {if (b & 1) x = x*a;a = a*a;b>>=1;}return x;}
ll ceil(ll a, ll b) {return (a + b - 1)/b;}
ll to_int(const string &s) {ll x = 0; for (int i = (s[0] == '-'); i < sz(s); i++) x = x*10 + s[i] - '0';return x*(s[0] == '-' ? -1: 1);}
bool is_prime(ll n) {if (n < 2) return 0;if (n < 4) return 1;if (n % 2 == 0 || n % 3 == 0) return 0;for (ll i = 5; i*i <= n; i+=6) {if(n % i == 0 || n % (i + 2) == 0) return 0;}return 1;}
bool is_square(ll n) {ll k = sqrt(n); return k*k == n;}
ll factorial(int n) {ll x = 1;for (int i = 2; i <= n; i++) x*=i;return x;}
ll factorial(int n, int m) {ll x = 1;for (ll i = 2; i <= n; i++) x = x*i % m;return x;}
bool is_power(ll n, ll k) {while (n % k == 0) n/=k;return n == 1ll;}
string str(ll n) {if (n == 0) return "0"; string s = ""; bool c = 0; if (n < 0) c = 1, n = -n; while (n) {s+=n % 10 + '0'; n/=10;} if (c) s+='-'; Reverse(s); return s;}
string repeat(const string &s, int n) {if (n < 0) return ""; string x = ""; while (n--) x+=s; return x;}
string bin(ll n) {string s = ""; while (n) {s+=(n & 1) + '0'; n>>=1;} Reverse(s); return s;}
void sieve(vector<bool> &a) {int n = a.size(); a[0] = a[1] = 0; for (int i = 4; i < n; i+=2) a[i] = 0; for (int i = 3; i*i < n; i+=2) {if (a[i]) {for (int j = i*i; j < n; j+=(i << 1)) a[j] = 0;}}}
void sieve(bool a[], int n) {a[0] = a[1] = 0; for (int i = 4; i < n; i+=2) a[i] = 0; for (int i = 3; i*i < n; i+=2) {if (a[i]) {for (int j = i*i; j < n; j+=(i << 1)) a[j] = 0;}}}
void sieve(vector<int> &a) {int n = a.size(); for (int i = 2; i < n; i+=2) a[i] = 2; for (int i = 3; i*i < n; i+=2) {if (!a[i]) {for (int j = i; j < n; j+=(i << 1)) a[j] = i;}} for (int i = 3; i < n; i+=2) {if (!a[i]) a[i] = i;}}
void sieve(int a[], int n) {for (int i = 2; i < n; i+=2) a[i] = 2; for (int i = 3; i*i < n; i+=2) {if (!a[i]) {for (int j = i; j < n; j+=(i << 1)) a[j] = i;}} for (int i = 3; i < n; i+=2) {if (!a[i]) a[i] = i;}}
vector<pii> factorize(int n) {vector<pii> a; for (int i = 2; i*i <= n; i++) {if (n % i == 0) {int k = 0; while (n % i == 0) k++, n/=i; a.emplace_back(i, k);}} if (n > 1) a.emplace_back(n, 1); return a;}
int rand(int l, int r) {return uniform_int_distribution<int>(l, r)(mt);}
int Log2(int n) {return 31 - __builtin_clz(n);}
template<class T> void compress(vector<T> &a) {vector<T> b; for (T &i: a) b.push_back(i); sort(all(b)); b.resize(unique(all(b)) - b.begin()); for (T &i: a) i = lower_bound(all(b), i) - b.begin() + 1;}
template<class A, class B> istream& operator>>(istream& in, pair<A, B> &p) {in >> p.first >> p.second; return in;}
template<class A, class B> ostream& operator<<(ostream& out, const pair<A, B> &p) {out << p.first << ' ' << p.second; return out;}
template<class T> istream& operator>>(istream& in, vector<T> &a) {for (auto &i: a) in >> i; return in;}
template<class T> ostream& operator<<(ostream& out, const vector<T> &a) {for (auto &i: a) out << i << ' '; return out;}
template<class T> istream& operator>>(istream& in, vector<vector<T>> &a) {for (auto &i: a) in >> i; return in;}
template<class T> ostream& operator<<(ostream& out, const vector<vector<T>> &a) {for (auto &i: a) out << i << '\n'; return out;}
template<class T> istream& operator>>(istream& in, deque<T> &a) {for (auto &i: a) in >> i; return in;}
template<class T> ostream& operator<<(ostream& out, const deque<T> &a) {for (auto &i: a) out << i << ' '; return out;}
// istream& operator>>(istream& in, __int128_t &a) {string s; in >> s; a = 0; for (auto &i: s) a = a*10 + (i - '0'); return in;}
// ostream& operator<<(ostream& out, __int128_t a) {string s = ""; while (a > 0) {s+=(int)(a % 10) + '0'; a/=10;} Reverse(s); out << s; return out;}
vi op(vi a, vi b) {
if (!a.back()) a.pop_back();
if (!a[0]) a.erase(a.begin());
if (!b.back()) b.pop_back();
if (!b[0]) b.erase(b.begin());
Sort(a); Sort(b);
vi c;
set_symmetric_difference(all(a), all(b), back_inserter(c));
c.resize(2);
return c;
}
int n;
vpair o;
void solve1() {
vvi a(n + 1, vi(2));
FOR(i,1,n) cin >> a[i][0];
vi v(n); iota(all(v), 1);
sort(all(v), [&](int i, int j){
return a[i][0] > a[j][0];
});
v.pop_back();
FOR(i,1,n) a[i][0] = i;
trav(m,v){
For(i,1,n) a[i] = op(a[i], a[i + 1]), o.eb(i, i + 1);
int j = 1;
for (; j <= n; j++) {
if (a[j][0] == m || a[j][1] == m) break;
}
if (j == n) a[j - 1] = op(a[j - 1], a[j]), o.eb(j - 1, j);
else if (a[j + 1][0] != m && a[j + 1][1] != m) {
For(i,j,n) a[i + 1] = op(a[i], a[i + 1]), o.eb(i + 1, i);
} else {
For(i,j+1,n) a[i + 1] = op(a[i], a[i + 1]), o.eb(i + 1, i);
Fore(i,j-1,1) a[i] = op(a[i], a[i + 1]), o.eb(i, i + 1);
}
n--;
}
n = sz(v);
Fore(i,n,1) o.eb(i, i + 1);
}
void solve2() {
vi a(n + 1);
FOR(i,1,n) cin >> a[i];
Fore(k,19,0){
For(i,1,n){
if ((a[i] >> k) & 1) {
FOR(j,i+1,n){
if ((a[j] >> k) & 1) a[j - 1]^=a[j], o.eb(j - 1, j);
else a[j]^=a[j - 1], o.eb(j, j - 1), a[j - 1]^=a[j], o.eb(j - 1, j);
}
n--;
break;
}
}
}
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
cout << fixed << setprecision(10);
int _; cin >> n >> _;
if (_ == 1) solve1();
else solve2();
cout << sz(o) << '\n';
trav(i,o) cout << i << '\n';
cerr << "\nProcess returned 0 (0x0) execution time : " << 0.001*clock() << " s";
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
460 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Correct |
2 ms |
348 KB |
Output is correct |
| 4 |
Correct |
4 ms |
848 KB |
Output is correct |
| 5 |
Correct |
4 ms |
860 KB |
Output is correct |
| 6 |
Correct |
4 ms |
860 KB |
Output is correct |
| 7 |
Correct |
4 ms |
856 KB |
Output is correct |
| 8 |
Correct |
7 ms |
860 KB |
Output is correct |
| 9 |
Correct |
4 ms |
860 KB |
Output is correct |
| 10 |
Correct |
4 ms |
860 KB |
Output is correct |
| 11 |
Correct |
4 ms |
860 KB |
Output is correct |
| 12 |
Correct |
4 ms |
860 KB |
Output is correct |
| 13 |
Correct |
7 ms |
860 KB |
Output is correct |
| 14 |
Correct |
4 ms |
860 KB |
Output is correct |
| 15 |
Correct |
7 ms |
856 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
460 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Correct |
2 ms |
348 KB |
Output is correct |
| 4 |
Correct |
4 ms |
848 KB |
Output is correct |
| 5 |
Correct |
4 ms |
860 KB |
Output is correct |
| 6 |
Correct |
4 ms |
860 KB |
Output is correct |
| 7 |
Correct |
4 ms |
856 KB |
Output is correct |
| 8 |
Correct |
7 ms |
860 KB |
Output is correct |
| 9 |
Correct |
4 ms |
860 KB |
Output is correct |
| 10 |
Correct |
4 ms |
860 KB |
Output is correct |
| 11 |
Correct |
4 ms |
860 KB |
Output is correct |
| 12 |
Correct |
4 ms |
860 KB |
Output is correct |
| 13 |
Correct |
7 ms |
860 KB |
Output is correct |
| 14 |
Correct |
4 ms |
860 KB |
Output is correct |
| 15 |
Correct |
7 ms |
856 KB |
Output is correct |
| 16 |
Correct |
0 ms |
348 KB |
Output is correct |
| 17 |
Correct |
4 ms |
860 KB |
Output is correct |
| 18 |
Correct |
7 ms |
1008 KB |
Output is correct |
| 19 |
Correct |
13 ms |
992 KB |
Output is correct |
| 20 |
Correct |
11 ms |
1044 KB |
Output is correct |
| 21 |
Correct |
7 ms |
992 KB |
Output is correct |
| 22 |
Correct |
7 ms |
992 KB |
Output is correct |
| 23 |
Correct |
7 ms |
988 KB |
Output is correct |
| 24 |
Correct |
7 ms |
992 KB |
Output is correct |
| 25 |
Correct |
7 ms |
996 KB |
Output is correct |
| 26 |
Correct |
6 ms |
988 KB |
Output is correct |
| 27 |
Correct |
7 ms |
992 KB |
Output is correct |
| 28 |
Correct |
7 ms |
992 KB |
Output is correct |
| 29 |
Correct |
12 ms |
992 KB |
Output is correct |
| 30 |
Correct |
8 ms |
992 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
600 KB |
Output is correct |
| 5 |
Correct |
3 ms |
988 KB |
Output is correct |
| 6 |
Correct |
4 ms |
992 KB |
Output is correct |
| 7 |
Correct |
3 ms |
988 KB |
Output is correct |
| 8 |
Correct |
3 ms |
992 KB |
Output is correct |
| 9 |
Correct |
3 ms |
900 KB |
Output is correct |
| 10 |
Correct |
6 ms |
992 KB |
Output is correct |
| 11 |
Correct |
3 ms |
988 KB |
Output is correct |
| 12 |
Correct |
6 ms |
992 KB |
Output is correct |
| 13 |
Correct |
4 ms |
972 KB |
Output is correct |
| 14 |
Correct |
3 ms |
992 KB |
Output is correct |
| 15 |
Correct |
6 ms |
992 KB |
Output is correct |
