제출 #939501

#제출 시각아이디문제언어결과실행 시간메모리
93950112345678 Martian DNA (BOI18_dna)C++17
0 / 100
86 ms27104 KiB
#include <bits/stdc++.h> using namespace std; const int nx=2e5+5; int n, v[nx], k, r, res[nx], b, q, ans=INT_MAX; vector<int> d[nx]; struct segtree { int d[4*nx]; void update(int l, int r, int i, int ql, int qr, int vl) { if (qr<l||r<ql||r<l) return; if (ql<=l&&r<=qr) return d[i]=min(d[i], vl), void(); int md=(l+r)/2; update(l, md, 2*i, ql, qr, vl); update(md+1, r, 2*i+1, ql, qr, vl); } void solve(int l, int r, int i) { if (d[i]==INT_MIN) return; if (l==r) return ans=min(ans, l-d[i]+1), void(); d[2*i]=min(d[2*i], d[i]); d[2*i+1]=min(d[2*i+1], d[i]); int md=(l+r)/2; solve(l, md, 2*i); solve(md+1, r, 2*i+1); } } s; int main() { cin.tie(NULL)->sync_with_stdio(false); cin>>n>>k>>r; for (int i=1; i<=n; i++) cin>>v[i], d[v[i]].push_back(i); for (int i=1; i<4*nx; i++) s.d[i]=INT_MAX; for (int i=1; i<=r; i++) { cin>>b>>q; d[b].push_back(n+1); s.update(1, n, 1, 1, d[b][q-1]-1, INT_MIN); for (int j=q; j<(int)d[b].size(); j++) s.update(1, n, 1, d[b][j-1], d[b][j]-1, d[b][j-q]); //s.solve(1, n, 1); } s.solve(1, n , 1); if (ans==INT_MAX) cout<<"impossible"; else cout<<ans; } /* 10 2 2 0 0 1 0 0 0 0 1 0 0 1 2 0 2 10 2 2 0 0 1 0 0 0 0 1 0 0 1 1 0 2 10 2 2 0 0 1 0 0 0 0 1 0 0 0 2 1 2 */
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