This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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 (l==r) return ans=min(ans, (d[i]!=INT_MIN)?l-d[i]+1:INT_MAX),void(); //cout<<l<<' '<<d[i]<<'\n', void();
int md=(l+r)/2;
d[2*i]=min(d[2*i], d[i]);
solve(l, md, 2*i);
d[2*i+1]=min(d[2*i+1], d[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<d[b].size(); j++) s.update(1, n, 1, d[b][j-1], d[b][j]-1, d[b][j-q]); //cout<<"update "<<d[b][j-1]<<' '<<d[b][j]-1<<' '<<d[b][j-q]<<'\n';
//cout<<"ask\n";
//s.solve(1,n , 1);
}
s.solve(1,n , 1);
if (ans==INT_MAX) cout<<"impossible";
else cout<<ans;
}
Compilation message (stderr)
dna.cpp: In function 'int main()':
dna.cpp:42:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
42 | for (int j=q; j<d[b].size(); j++) s.update(1, n, 1, d[b][j-1], d[b][j]-1, d[b][j-q]); //cout<<"update "<<d[b][j-1]<<' '<<d[b][j]-1<<' '<<d[b][j-q]<<'\n';
| ~^~~~~~~~~~~~
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