[AtCoder] C - Adjacent Swaps

C - Adjacent Swaps

  • Time : O(q)
  • Space : O(n)
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#include <bits/stdc++.h>

#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")//Comment optimisations for interactive problems (use endl)
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")

struct PairHash {inline std::size_t operator()(const std::pair<int,int> & v) const {return v.first*31+v.second;}};

#define MAX_N 202020
#define INF 987654321
#define EPS 1e-9
#define ll long long
#define pll pair<ll, ll>
#define vpll vector<pll>
#define vall3 vector<array<ll,3>>
#define all3 array<ll,3>
#define all5 array<ll,5>
#define vall5 vector<all5>
#define vll vector<ll>
#define vi vector<int>
#define vs vector<string>
#define usll unordered_set<ll>
#define uspll unordered_set<pll, PairHash>
#define vvs vector<vs>
#define vvll vector<vll>
#define all(a) begin(a), end(a)
#define rall(a) rbegin(a), rend(a)

using namespace std;

vll solve(vll& A, vll& Q) {
unordered_map<ll,ll> mp;
ll n = A.size();
for(ll i = 0; i < n; i++) mp[A[i]] = i;
for(auto& q : Q) {
ll i = mp[q];
ll j = (i + 1 == n ? i - 1 : i + 1);
swap(A[i], A[j]);
swap(mp[A[i]], mp[A[j]]);
}
return A;
}

int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
ll tc = 1;
//cin>>tc;
for(ll i = 1; i <= tc; i++) {
ll n, q;
cin>>n>>q;
vll A(n), Q(q);
for(ll j = 0; j < n; j++) A[j] = j + 1;
for(ll j = 0; j < q; j++) cin>>Q[j];
auto res = solve(A,Q);
for(auto& r : res) cout<<r<<' ';cout<<endl;
}
return 0;
}
Author: Song Hayoung
Link: https://songhayoung.github.io/2022/06/16/PS/AtCoder/abc250-c/
Copyright Notice: All articles in this blog are licensed under CC BY-NC-SA 4.0 unless stating additionally.