Submission #1056528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056528		mindiyak	Martian DNA (BOI18_dna)	C++14	0 / 100	14 ms	1824 KiB

dna

#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#include <bits/stdc++.h>
#include <string>
#include <iostream>
#include <cmath>
#include <numeric>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ld, ld> pd;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<pi>> vvpi;
typedef vector<ld> vd;
typedef vector<long long> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
#define FOR(i, a, b) for (int i = a; i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto &a : x)
#define uid(a, b) uniform_int_distribution<int>(a, b)(rng)
#define len(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define F first
#define nl endl
#define S second
#define lb lower_bound
#define ub upper_bound
#define aint(x) x.begin(), x.end()
#define raint(x) x.rbegin(), x.rend()
#define ins insert
const int M = 1e9+7;
void init(string name)
{
    freopen((name + ".in").c_str(), "r", stdin);
    freopen((name + ".out").c_str(), "w", stdout);
}
void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}

int n,r,k;

void solve()
{
    cin >> n >> k >> r;
    vi arr(n);
    FOR(i,0,n)cin >> arr[i];

    vi needed(k,0);
    int counter = 0;
    FOR(i,0,r){
        int a,b;cin >> a >> b;
        if(b == 0)counter ++;
        needed[a] = b;
    }
    r = r-counter;

    if(r == 0){
        cout << 0 << endl;
        return;
    } 

    int ans = n+1;

    int start = 0;
    while(start < n){
        int s = start;
        int e = s;
        vi tmp = needed;
        // for(int i:tmp)cerr << i << " ";
        // cerr << endl;
        int cnt = 0;
        while(e < n){
            if(tmp[arr[e]] == 1)cnt ++;
            tmp[arr[e]] --;
            e++;
            if(cnt == r)break;
        }
        while(cnt == r && s < e){
            if(tmp[arr[s]] >= 0)break;
            tmp[arr[s]] ++;
            s++;
        }

        // FOR(i,s,e){
        //     cerr << arr[i] << " ";
        // }cerr << " -> " << cnt << " | " << s << " " << e << endl;

        if(cnt == r){
            ans = min(ans,e-s);
        }


        start = e;
    }


    if(ans != n+1){
        cout << ans << endl;
        return;
    }
    cout << "impossible" << endl;
}   


int main()
{
    fastIO();
    // init("test");
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
    return 0;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string)':
dna.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     freopen((name + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dna.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen((name + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 24
• Subtask 3: 0 / 28
• Subtask 4: 0 / 32