Submission #1194386

#	Time	Username	Problem	Language	Result	Execution time	Memory
1194386		Valters07	Martian DNA (BOI18_dna)	C++20	100 / 100	138 ms	24760 KiB

dna

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt,tune=native")
#define fio ios_base::sync_with_stdio(0);cin.tie(0);
#define ll long long
#define ld long double
#define en exit(0);
#define pb push_back
#define fi first
#define se second
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int N = 2e5 + 5;
const int INF = 1e9 + 5;
vector<int> pos[N], ops[N];
int main()
{
    fio
//    ifstream cin("in.in");
    int n, k, r;
    cin >> n >> k >> r;
    int a[n + 1];
    for(int i = 0;i < k;i++)
        pos[i].pb(0);
    for(int i = 1;i <= n;i++)
    {
        cin >> a[i];
        pos[a[i]].pb(i);
    }
    int to = n;
    while(r--)
    {
        int val, mn;
        cin >> val >> mn;
        vector<int> &ve = pos[val];
        int sz = ve.size();
        if(sz - 1 < mn)
            return cout << "impossible", 0;
        for(int i = mn;i < sz;i++)
        {
            int l = ve[i - mn] + 1, r = ve[i - mn + 1];
            int x = ve[i];
            ops[l].pb(x);
            ops[r + 1].pb(-x);
        }
        to = min(to, ve[sz - mn]);
    }
    int res = INF;
    multiset<int> s;
    for(int i = 1;i <= to;i++)
    {
        for(auto x:ops[i])
        {
            if(x > 0)
                s.insert(x);
            else
                s.erase(s.find(-x));
        }
        assert(!s.empty());
        int r = *s.rbegin();
        res = min(res, r - i + 1);
    }
    cout << res;
    return 0;
}

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