Submission #1124836

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124836		luvna	Martian DNA (BOI18_dna)	C++20	100 / 100	28 ms	2544 KiB

dna

#include<bits/stdc++.h>

#define MASK(i) (1 << (i))
#define pub push_back
#define all(v) v.begin(), v.end()
#define compact(v) v.erase(unique(all(v)), end(v))
#define pii pair<int,int>
#define fi first
#define se second
#define endl "\n"
#define sz(v) (int)(v).size()
#define dbg(x) "[" #x " = " << (x) << "]"

using namespace std;

template<class T> bool minimize(T& a, T b){if(a > b) return a = b, true;return false;}
template<class T> bool maximize(T& a, T b){if(a < b) return a = b, true;return false;}

typedef long long ll;
typedef long double ld;

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r){return uniform_int_distribution<ll>(l, r)(rng);}

const int N = 2e5 + 15;
const int INF = 1e9;

int n, k, q;
int a[N];
int freq[N];
int ask[N];

void solve(){
    cin >> n >> k >> q;

    for(int i = 1; i <= n; i++) cin >> a[i];

    for(int i = 1; i <= q; i++){
        int u, quant; cin >> u >> quant;
        ask[u] = quant;
    }

    int ans = INF, full = 0;

    for(int i = 1, j = 1; i <= n; i++){
        freq[a[i]]++;
        if(ask[a[i]] && freq[a[i]] == ask[a[i]]) full++;
        while(j < i){
            if(ask[a[j]] && freq[a[j]] <= ask[a[j]]) break;
            freq[a[j]]--;
            j++;
        }
        if(full == q) minimize(ans, i - j + 1);
    }

    if(ans == INF) cout << "impossible" << endl;
    else cout << ans << endl;
}

signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(0); cout.tie(0);

    #define task "task"

    if(fopen(task".INP", "r")){
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

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

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:67:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
dna.cpp:68:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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