Submission #382490

#	Time	Username	Problem	Language	Result	Execution time	Memory
382490		vishesh312	Martian DNA (BOI18_dna)	C++17	0 / 100	32 ms	2540 KiB

dna

#include "bits/stdc++.h"
using namespace std;
/*
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using ordered_set = tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>;
*/

#define all(x) begin(x), end(x)
#define sz(x) (int)x.size()

using ll = long long;
#define int ll
const int mod = 1e9+7;

void solve(int tc) {
    int n, k, r;
    cin >> n >> k >> r;
    vector<int> v(n);
    for (auto &x : v) cin >> x;
    vector<int> a(k);
    int req = 0;
    for (int i = 0; i < r; ++i) {
        int x, y;
        cin >> x >> y;
        a[x] += y;
        req += y;
    }
    if (a[v[0]] >0) --req;
    a[v[0]]--;
    int l = 0;
    r = 0;
    int ans = mod;
    while (r < n-1) {
        while (req == 0) {
            ans = min(ans, r-l+1);
            if (a[v[l]] >= 0) req++;
            a[v[l]]++;
        }
        while (req > 0 and r+1 < n) {
            ++r;
            if (a[v[r]] > 0) --req;
            a[v[r]]--;
        }
        if (req == 0) ans = min(ans, r-l+1);
    }
    if (ans >= mod) cout << "impossible\n";
    cout << ans << '\n';
}

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int tc = 1;
    //cin >> tc;
    for (int i = 1; i <= tc; ++i) solve(i);
    return 0;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 24
• Subtask 3: 0 / 28
• Subtask 4: 0 / 32