Submission #632133

#	Time	Username	Problem	Language	Result	Execution time	Memory
632133		TranGiaHuy1508	Martian DNA (BOI18_dna)	C++17	100 / 100	64 ms	6276 KiB

dna

/*
	Unknown's C++ Template (v3.2)
*/

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

#define int long long

using ll = long long;
using ld = long double;
using ii = pair<int, int>;
using vi = vector<int>;
using vii = vector<ii>;
using vvi = vector<vi>;
using vvii = vector<vii>;
template <class T> using maxpq = priority_queue<T>;
template <class T> using minpq = priority_queue<T, vector<T>, greater<T>>;

#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mid ((l+r)>>1)
#define fi first
#define se second

#ifdef LOCAL
	#define debug(x) cout << #x << " = " << x << "\n";
#else
	#define debug(x) ;
#endif

template <class A, class B>
ostream& operator << (ostream& out, pair<A, B> x)
{ out << "(" << x.first << ", " << x.second << ")"; return out; }

template <class T>
ostream& operator << (ostream& out, vector<T> x){
	out << "[";
	for (int i=0; i<sz(x); i++) { out << (i ? ", " : "") << x[i]; }
	out << "]"; return out;
}

template <class T>
istream& operator >> (istream& in, vector<T> &x){
	for (auto &i: x) in >> i;
	return in;
}

const ld PI = acos(-1.0);
const int allmod[3] = {(int)1e9+7, 998244353, (int)1e9+9};
const int mod = allmod[0];
const int maxn = 2e5 + 64;
const ll inf = 1e18;
const ld eps = 1e-6;
const int multitest = 0;

int n, k, q, tt;
vi v, req, cnt;

bool check(int X){
	cnt.assign(k, 0); tt = k - q;
	for (int i = 0; i < X; i++){
		cnt[v[i]]++;
		if (req[v[i]] == cnt[v[i]]) tt++;
	}
	if (tt == k) return true;
	for (int i = X; i < n; i++){
		if (req[v[i-X]] == cnt[v[i-X]]) tt--;
		cnt[v[i-X]]--;
		cnt[v[i]]++;
		if (req[v[i]] == cnt[v[i]]) tt++;
		if (tt == k) return true;
	}
	return false;
}

void main_program(){
	cin >> n >> k >> q;
	v.resize(n); cin >> v;
	req.assign(k, 0);

	for (int i = 0; i < q; i++){
		int x, y; cin >> x >> y; req[x] = y;
	}

	int l = 1, r = n + 1;
	while (r - l > 1){
		if (check(mid)) r = mid;
		else l = mid + 1;
	}
	if (l <= n && check(l)) cout << l << "\n";
	else if (r > n) cout << "impossible\n";
	else cout << r << "\n";
}

void pre_main(){

}

signed main(){
	#ifdef LOCAL
		auto stime = chrono::high_resolution_clock::now();
	#endif
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	#ifndef ONLINE_JUDGE
		if (fopen(".inp", "r")){
			freopen(".inp", "r", stdin);
			freopen(".out", "w", stdout);
		}
	#endif
	int t = 1; if (multitest) cin >> t;
	pre_main();
	while (t--) main_program();
	#ifdef LOCAL
		auto etime = chrono::high_resolution_clock::now();
		auto duration = chrono::duration_cast<chrono::milliseconds>(etime-stime).count();
		cout << "\n[" << duration << "ms]\n";
	#endif
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:108:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  108 |    freopen(".inp", "r", stdin);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~
dna.cpp:109:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |    freopen(".out", "w", stdout);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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