Submission #1129664

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129664		KasymK	Martian DNA (BOI18_dna)	C++20	68 / 100	2095 ms	3000 KiB

dna

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 2e5+5;
int v[N], sm[N];

int main(){
    int n, k, q;
    scanf("%d%d%d", &n, &k, &q);
    for(int i = 1; i <= n; ++i)
        scanf("%d", v+i);
    vector<pii> A;
    while(q--){
        int a, b;
        scanf("%d%d", &a, &b);
        A.pb({a, b});
    }
    auto is = [&](int x) -> bool {
        memset(sm, 0, sizeof sm);
        deque<int> dq;
        for(int i = 1; i <= x; ++i)
            dq.pb(v[i]), sm[v[i]]++;
        bool ok=1;
        for(int ad = 0; ad < (int)A.size(); ++ad)
            ok&=(A[ad].ss<=sm[A[ad].ff]);
        if(ok)
            return 1;
        for(int i = x+1; i <= n; ++i){
            ok=1;
            sm[dq[0]]--;
            dq.pop_front();
            dq.pb(v[i]);
            sm[v[i]]++;
            for(int ad = 0; ad < (int)A.size(); ++ad)
                ok&=(A[ad].ss<=sm[A[ad].ff]);
            if(ok)
                return 1;
        }
        return 0;
    };
    int l=1, r=n, answer=-1;
    while(l<=r){
        int mid=(l+r)>>1;
        if(is(mid))
            r=mid-1, answer=mid;
        else
            l=mid+1;
    }
    if(~answer)
        printf("%d\n", answer);
    else
        puts("impossible");
    return 0;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     scanf("%d%d%d", &n, &k, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
dna.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         scanf("%d", v+i);
      |         ~~~~~^~~~~~~~~~~
dna.cpp:26:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         scanf("%d%d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~

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