Submission #1089569

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089569		Tymond	Martian DNA (BOI18_dna)	C++17	100 / 100	39 ms	15700 KiB

dna

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define fi first
#define se second
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count());
inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);}
inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);}
#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

const int MAXN = 2e5 + 7;
vi pos[MAXN];
int mn[MAXN];
int a[MAXN];
int c[MAXN];
int wsk[MAXN];
int n, k, r;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    cin >> n >> k >> r;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
        pos[a[i]].pb(i);
    }

    for(int i = 1; i <= r; i++){
        int x;
        cin >> x;
        cin >> mn[x];
    }

    int mx = 1;
    for(int i = 0; i < k; i++){
        if(sz(pos[i]) < mn[i]){
            cout << "impossible\n";
            return 0;
        }
        if(mn[i] == 0){
            continue;
        }
        wsk[i] = mn[i];
        c[i] = sz(pos[i]);
        mx = max(mx, pos[i][mn[i] - 1]);
    }

    int ans = n;
    for(int i = 1; i <= n; i++){
        ans = min(ans, mx - i + 1);

        if(mn[a[i]] > 0){
            if(wsk[a[i]] >= sz(pos[a[i]])){
                break;
            }
            mx = max(mx, pos[a[i]][wsk[a[i]]]);
            wsk[a[i]]++;
        }
    }

    cout << ans << '\n';

    return 0;
}

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