Submission #114523

#	Time	Username	Problem	Language	Result	Execution time	Memory
114523		Meloric	Global Warming (CEOI18_glo)	C++14	100 / 100	178 ms	5728 KiB

glo

#include <bits/stdc++.h>
#define pb push_back
#define X first
#define Y second
#define pii pair<int, int>
#define lb lower_bound

using namespace std;
int n, x;
vector<int> in, srt;

struct ft{
    vector<int> fen;
    ft(int N){
        fen.assign(N+1, 0);
    }
    int qer(int a){
        a++;
        int ans = 0;
        for(;a>0; a-=a&(-a))ans=max(ans, fen[a]);
        return ans;
    }
    void upd(int a, int b){
        a++;
        for(;a<fen.size(); a+=a&(-a))fen[a]=max(b, fen[a]);
    }
};

int main(){
    cin >> n >> x;
    for(int i = 0; i<n; i++){
        int c; cin >> c;
        in.pb(c); srt.pb(c);
    }
    sort(srt.begin(), srt.end());
    ft yes(n), no(n);
    for(auto i : in){
        int id = lb(srt.begin(), srt.end(), i)-srt.begin();
        int tmp = no.qer(id-1);
        int nid = lb(srt.begin(), srt.end(), i+x)-srt.begin();
        int tmp2 = no.qer(nid-1);
        no.upd(id, tmp+1);
        tmp = yes.qer(id-1);
        tmp = max(tmp, tmp2);
        yes.upd(id, tmp+1);
    }
    cout << yes.qer(n-1);
    return 0;
}

Compilation message (stderr)

glo.cpp: In member function 'void ft::upd(int, int)':
glo.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(;a<fen.size(); a+=a&(-a))fen[a]=max(b, fen[a]);
              ~^~~~~~~~~~~

• 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