Submission #927053

#	Time	Username	Problem	Language	Result	Execution time	Memory
927053		Pragmatism	Martian DNA (BOI18_dna)	C++17	100 / 100	86 ms	4972 KiB

dna

//Bismillahir-Rahmanir-Rahim

#include <bits/stdc++.h>
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#pragma GCC target("sse,sse2,sse3,sse4,sse4.1,sse4.2,popcnt,avx,avx2")

#define pb push_back
#define pii pair <int, int>
#define pll pair <long long, long long>
#define pld pair <long double, long double>
#define ll long long
#define ld long double
#define x first
#define y second
#define all(v) v.begin(),v.end()
#define sz(s) (int)s.size()
#define skip continue
#define bpop(x) (ll)__builtin_popcountll(x)

using namespace std;

const int N = 2e5 + 7;
const int M = 5e3 + 7;
const int maxA = 2e6 + 7;
const int inf = 1e9 + 7;
const ll INF = 2e18 + 7;
const int MOD = 1e9 + 7;
const ld eps = 1e-9;

pii dir[] = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//#define int long long

int n, k, q, a[N], req[N], t[4 * N];
void update(int v, int tl, int tr, int pos, int x) {
    if (tl == tr) {
        t[v] += x;
        return;
    }
    int mid = (tl + tr) / 2;
    if (pos <= mid)update(v * 2, tl, mid, pos, x);
    else update(v * 2 + 1, mid + 1, tr, pos, x);
    t[v] = max(t[v * 2], t[v * 2 + 1]);
}
void solve() {
    cin >> n >> k >> q;
    for (int i = 1;i <= n;i++)cin >> a[i], a[i]++;
    for (int i = 1;i <= q;i++) {
        int x, cnt;
        cin >> x >> cnt;
        req[++x] = cnt, update(1, 1, n, x, cnt);
    }
    int r = 0, ans = inf;
    for (int l = 1;l <= n;l++) {
        while (r < n && t[1] > 0)r++, update(1, 1, n, a[r], -1);
        if (t[1] <= 0)ans = min(ans, r - l + 1);
        update(1, 1, n, a[l], 1);
    }
    if (ans == inf)cout << "impossible";
    else cout << ans;
}
signed main() {
    //srand(time(NULL));
    ios_base::sync_with_stdio(0);
    cout.tie(0);
    //freopen("tests.in", "r", stdin);
    //freopen("milkorder.out", "w", stdout);
    int test = 1;
    //cin >> test;
    for (int t = 1;t <= test;t++) {
        //cout << "Case " << t << ": ";
        solve();
    }
    return 0;
}

Compilation message (stderr)

dna.cpp:4: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    4 | #pragma comment(linker, "/stack:200000000")
      |

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32