Submission #683336

#	Time	Username	Problem	Language	Result	Execution time	Memory
683336		nifeshe	Collider (IZhO11_collider)	C++17	100 / 100	89 ms	12012 KiB

collider

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC target ("avx2")
//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("unroll-loops")
//#pragma comment (linker, "/STACK: 16777216")

#define f first
#define s second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) ((int)(x).size())
#define pb push_back
#define mp make_pair
#define int long long

using namespace std;
using namespace __gnu_pbds;

template <typename T> inline bool umax(T &a, const T &b) { if(a < b) { a = b; return 1; } return 0; }
template <typename T> inline bool umin(T &a, const T &b) { if(a > b) { a = b; return 1; } return 0; }
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
template <typename T> using oset = tree<T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;

const ll mod = 998244353;
const ll base = 1e6 + 5;
const ll inf = 1e18;
const int MAX = 1e6;
const int lg = 20;

random_device rd;
mt19937 gen(rd());
uniform_int_distribution<ll> dis(1, inf);

const int buben = 1000;

void solve() {
    int n, q;
    cin >> n >> q;
    int nb = (n + buben - 1) / buben;
    vector<deque<char>> dq(nb + 1);
    string s;
    cin >> s;
    vector<int> bl(n), lb(nb), rb(nb);
    for(int i = 0; i < n; i++) {
        bl[i] = i / buben;
        lb[bl[i]] = bl[i] * buben;
        rb[bl[i]] = min(lb[bl[i]] + buben - 1, n - 1);
    }
    for(int i = 0; i < n; i++) {
        dq[bl[i]].pb(s[i]);
    }
    auto norm = [&]() {
        for(int i = 0; i < nb; i++) {
            int sz = rb[bl[i]] - lb[bl[i]];
            while(sz(dq[i]) > sz) {
                dq[i + 1].push_front(dq[i].back());
                dq[i].pop_back();
            }

            while(sz(dq[i]) < sz) {
                dq[i].pb(dq[i + 1].front());
                dq[i + 1].pop_front();
            }
        }
    };
    while(q--) {
        char t;
        cin >> t;
        if(t == 'a') {
            int i, j;
            cin >> i >> j;
            i--, j--;
            int idx = 0;
            while(idx < nb && i - sz(dq[idx]) >= 0) i -= sz(dq[idx++]);
            char add = dq[idx][i];
            dq[idx].erase(dq[idx].begin() + i);
            idx = 0;
            while(idx < nb && j - sz(dq[idx]) >= 0) j -= sz(dq[idx++]);
            dq[idx].insert(dq[idx].begin() + j, add);
            norm();
        }
        else {
            int i;
            cin >> i;
            i--;
            int idx = 0;
            while(i - sz(dq[idx]) >= 0) i -= sz(dq[idx++]);
            cout << dq[idx][i] << '\n';
        }
    }
}

signed main() {
//    freopen("collider.in", "r", stdin); freopen("collider.out", "w", stdout);
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int ttt = 1;
//    cin >> ttt;
    while(ttt--) {
        solve();
    }
    return 0;
}

• Subtask 1: 100 / 100