Submission #538268

#	Time	Username	Problem	Language	Result	Execution time	Memory
538268		DJ035	Global Warming (CEOI18_glo)	C++17	100 / 100	55 ms	5840 KiB

glo

#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,avx,avx2")
#include <bits/stdc++.h>
#define MEM 1111111
#define sanic ios_base::sync_with_stdio(0)
#define x first
#define y second
#define pf push_front
#define pb push_back
#define all(v) v.begin(), v.end()
#define sz size()
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pi;
const ll INF = 1e17+7;
const ll MOD = 998244353;
ll gcd(ll a, ll b){
    if(a%b) return gcd(b, a%b);
    return b;
}
ll t,n,m,a,b,x;
signed main(){
    sanic; cin.tie(0);
    cin >> n >> x;
    vector<ll> l;
    for(int i=0; i<n; i++){
        ll q;
        cin >> q;
        l.pb(q);
    }
    vector<int> lis,dp(n);
    lis.pb(-INF);
    for(int i=0; i<n; i++){
        if(lis.back()<l[i]){
            lis.pb(l[i]);
            dp[i] = lis.sz-1;
        }
        else{
            int idx=lower_bound(lis.begin(), lis.end(), l[i])-lis.begin();
            lis[idx] = l[i];
            dp[i] = idx;
        }
    }
    vector<int> p;
    p.pb(-INF);
    int ans=0;
    for(int i=n-1; i>=0; i--){
        int id=lower_bound(p.begin(), p.end(), -l[i]+x)-p.begin();
        //cout << dp[i] << ' ' << id-1 << '\n';
        ans = max(dp[i]+id-1, ans);
        if(p.back()<-l[i])
            p.pb(-l[i]);
        else{
            int idx=lower_bound(p.begin(), p.end(), -l[i])-p.begin();
            p[idx] = -l[i];
        }
    }
    cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:34:12: warning: overflow in conversion from 'long long int' to 'std::vector<int>::value_type' {aka 'int'} changes value from '-100000000000000000' to '-1569325056' [-Woverflow]
   34 |     lis.pb(-INF);
      |            ^~~~
glo.cpp:47:10: warning: overflow in conversion from 'long long int' to 'std::vector<int>::value_type' {aka 'int'} changes value from '-100000000000000000' to '-1569325056' [-Woverflow]
   47 |     p.pb(-INF);
      |          ^~~~

• 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