Submission #1298560

#	Time	Username	Problem	Language	Result	Execution time	Memory
1298560		thaibeo123	Martian DNA (BOI18_dna)	C++20	100 / 100	154 ms	141264 KiB

dna

#include <bits/stdc++.h>
using namespace std;

#define NAME "A"
#define ll long long
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define MASK(x) (1ll << (x))
#define BIT(x, i) (((x) >> (i)) & 1)

const int N = 2e5 + 5;
const int inf = 1e9;

int n, k, r;
int a[N], val[N];
deque<int> dq[N];
multiset<int> s;

void input() {
    cin >> n >> k >> r;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    for (int i = 1; i <= r; i++) {
        int b;
        cin >> b;
        cin >> val[b];
    }
}

void solve() {
    int ans = inf;
    for (int i = 1; i <= n; i++) {
        if (val[a[i]] == 0) continue;
        dq[a[i]].push_back(i);
        if ((int)dq[a[i]].size() > val[a[i]]) {
            s.erase(s.find(dq[a[i]].front()));
            dq[a[i]].pop_front();
            s.insert(dq[a[i]].front());
        }
        else if ((int)dq[a[i]].size() == val[a[i]]) {
            s.insert(dq[a[i]].front());
        }
        //cout << i << " " << s.size() << " " << dq[a[i]].size() << "\n";
        if ((int)s.size() == r) {
            ans = min(ans, i - *s.begin() + 1);
        }
    }
    if (ans == inf) {
        cout << "impossible";
        return;
    }
    cout << ans;
}

signed main() {
    if (fopen(NAME".INP", "r")) {
        freopen(NAME".INP", "r", stdin);
        freopen(NAME".OUT", "w", stdout);
    }
    cin.tie(0)->sync_with_stdio(0);

    int t = 1;
    //cin >> t;
    while (t--) {
        input();
        solve();
    }

    return 0;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen(NAME".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
dna.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(NAME".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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