Submission #116159

#	Time	Username	Problem	Language	Result	Execution time	Memory
116159		JohnTitor	Global Warming (CEOI18_glo)	C++11	100 / 100	58 ms	4340 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, j, k) for(int i=(j); i<=(k); i++)
#define FFOR(i, j, k) for(int i=(j); i<(k); i++)
#define DFOR(i, j, k) for(int i=(j); i>=(k); i--)
#define bug(x) cerr<<#x<<" = "<<(x)<<'\n'
#define pb push_back
#define mp make_pair
#define bit(s, i) (((s)>>(i))&1LL)
#define mask(i) ((1LL<<(i)))
#define builtin_popcount __builtin_popcountll
#define __builtin_popcount __builtin_popcountll
using ll=long long; using ld=long double;
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); const ld pi=acos(0)*2;
template <typename T> inline void read(T &x){char c; bool nega=0; while((!isdigit(c=getchar()))&&(c!='-')); if(c=='-'){nega=1; c=getchar();} x=c-48; while(isdigit(c=getchar())) x=x*10+c-48; if(nega) x=-x;}
template <typename T> inline void writep(T x){if(x>9) writep(x/10); putchar(x%10+48);}
template <typename T> inline void write(T x){if(x<0){ putchar('-'); x=-x;} writep(x);}
template <typename T> inline void writeln(T x){write(x); putchar('\n');}
#define taskname "Global"
int n, x;
int a[200001];
int l[200001];
vector <int> f;
int main(){
    #ifdef Aria
        if(fopen(taskname".in", "r"))
            freopen(taskname".in", "r", stdin);
    #endif // Aria
    read(n);
    read(x);
    FOR(i, 1, n) read(a[i]);
    f.pb(-1e9);
    FOR(i, 1, n){
        if(a[i]>f.back()){
            l[i]=f.size();
            f.pb(a[i]);
        }
        else{
            l[i]=lower_bound(f.begin(), f.end(), a[i])-f.begin();
            f[l[i]]=min(f[l[i]], a[i]);
        }
    }
    f.clear();
    f.pb(1.5e9);
    int ans=0;
    DFOR(i, n, 1){
        int t=a[i]-x;
        if(t<f.back()) ans=max(ans, (int)(l[i]+f.size()-1));
        else ans=max(ans, (int)(l[i]+lower_bound(f.begin(), f.end(), t, greater<int>())-f.begin()-1));
        if(a[i]<f.back()) f.pb(a[i]);
        else{
            t=lower_bound(f.begin(), f.end(), a[i], greater<int>())-f.begin();
            f[t]=max(f[t], a[i]);
        }
    }
    writeln(ans);
}

• 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