Submission #714415

#	Time	Username	Problem	Language	Result	Execution time	Memory
714415		ln_e	Global Warming (CEOI18_glo)	C++17	100 / 100	780 ms	42892 KiB

glo

#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho
using ll=long long;
using ld=long double;
int const INF=1000000005;
ll const LINF=1000000000000000005;
ll const mod=1000000007;
ld const PI=3.14159265359;
ll const MAX_N=3e5+5;
ld const EPS=0.00000001;
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define endl '\n'
#define sz(a) (int)a.size()
#define CODE_START  ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n,a[2000005],dp[2000005][3],x,tree[3][400005];
map<ll,ll>val;
void update1(ll pos,ll val){
for(;pos<=2*n+1;pos+=pos&(-pos)){
    tree[1][pos]=max(tree[1][pos],val);
}
}
void update2(ll pos,ll val){
for(;pos<=2*n+1;pos+=pos&(-pos)){
    tree[2][pos]=max(tree[2][pos],val);
}
}
ll query1(ll pos){
ll res=0;
for(;pos;pos-=pos&(-pos)){
    res=max(res,tree[1][pos]);
}
return res;
}
ll query2(ll pos){
ll res=0;
for(;pos;pos-=pos&(-pos)){
    res=max(res,tree[2][pos]);
}
return res;
}
int32_t main(){
CODE_START;
#ifdef LOCAL
ifstream cin("input.txt");
#endif
cin>>n>>x;
vector<ll>v;
v.pb(x);
for(ll i=1;i<=n;i++)
{
    cin>>a[i];
    v.pb(a[i]);
    v.pb(a[i]+x-1);
}
sort(v.begin(),v.end());
ll vl=0;
for(ll i=0;i<v.size();i++)
{
    if(i==0||v[i]!=v[i-1]){
        val[v[i]]=++vl;
    }
}
for(ll i=1;i<=n;i++)
{
    dp[i][0]=query1(val[a[i]]-1)+1;
    dp[i][1]=query2(val[a[i]]-1)+1;
    dp[i][1]=max(dp[i][1],query1(val[a[i]+x-1])+1);
    update1(val[a[i]],dp[i][0]);
    update2(val[a[i]],dp[i][1]);
}
ll ans=0;
for(ll i=1;i<=n;i++)
{
    ans=max(ans,dp[i][0]);
    ans=max(ans,dp[i][1]);
}
cout<<ans<<endl;
}

Compilation message (stderr)

glo.cpp: In function 'int32_t main()':
glo.cpp:62:13: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 | for(ll i=0;i<v.size();i++)
      |            ~^~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25