Submission #1127481

#	Time	Username	Problem	Language	Result	Execution time	Memory
1127481		MinhTuan11	Martian DNA (BOI18_dna)	C++20	100 / 100	32 ms	4936 KiB

dna

#include <bits/stdc++.h>

#define int long long
#define fi first
#define se second

const int N = 2e5 + 5;
const int K = 1e2 + 5;
const int mod = 1e9 + 7;
const int inf = 1e18 + 7;

#define all(v) (v).begin(), (v).end()
#define pii pair<int, int> 

using namespace std;

mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());

int n, k, r, a[N];
int b[N], c[N];

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    if(ifstream("file.inp")){
    	freopen("file.inp", "r", stdin);
    	freopen("file.out", "w", stdout);
    }
    
    cin >> n >> k >> r;
    for(int i = 1; i <= n; i++) cin >> a[i];
    memset(b, -1, sizeof b);
    for(int i = 1, x, y; i <= r; i++) {
    	cin >> x >> y;
    	b[x] = y;
    }
    int j = 1, com = 0, res = n + 1;
    for(int i = 1; i <= n; i++) {
    	c[a[i]]++;
    	if(c[a[i]] == b[a[i]] && b[a[i]] != -1) com++;
    	while(c[a[j]] > b[a[j]] || b[a[j]] == -1) c[a[j++]]--;
    	if(com == r) {
    		res = min(res, i - j + 1);
    	}
    }
    if(res == n + 1) cout << "impossible";
    else cout << res << '\n';
    
    return 0;
}

// tuntun

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen("file.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
dna.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen("file.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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