Submission #877430

#	Time	Username	Problem	Language	Result	Execution time	Memory
877430		dead0ne	Global Warming (CEOI18_glo)	C++17	100 / 100	47 ms	8144 KiB

glo

#pragma GCC optimize("unroll-loops,Ofast,O3")
#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define spc << " " <<
#define endl "\n"
#define all(x) x.begin(), x.end()
#define int long long
#define ii pair<int,int>
#define vi vector<int>
#define vii vector<ii>
#define st first
#define nd second
#define inf 1000000009
#define MOD 1000000007
#define lim 200005
using namespace std;




void solve(){
    int n,x; cin >> n >> x;
    int arr[n+1], bef[n+1], aft[n+1];
    for(int i=1; i<=n; i++) cin >> arr[i];

    vector<int> lis;
    for(int i=1; i<=n; i++){
        bef[i] = lower_bound(all(lis), arr[i]+x) - lis.begin();
        //cerr << arr[i] spc bef[i] << endl;

        int pos = lower_bound(all(lis), arr[i]) - lis.begin();
        if(pos == lis.size()) lis.pb(arr[i]);
        else lis[pos] = arr[i];
    }
    lis.clear();

    for(int i=n; i>=1; i--){
        int pos = lower_bound(lis.begin(), lis.end(), arr[i], greater<int>()) - lis.begin();
        if(pos == lis.size()) lis.pb(arr[i]);
        else lis[pos] = arr[i];
        aft[i]=pos+1;
    }

    int ans=0;
    for(int i=1; i<=n; i++) ans = max(ans, bef[i]+aft[i]);
    cout << ans << endl;
}



signed main(){
    ios_base::sync_with_stdio(false);cin.tie(0);
    #ifdef Local
    freopen("in","r",stdin);
    freopen("out","w",stdout);
    #endif

    /*freopen("fcolor.in","r",stdin);
    freopen("fcolor.out","w",stdout);*/

    int t=1;
    //cin >> t;
    while(t--) solve();
}

Compilation message (stderr)

glo.cpp: In function 'void solve()':
glo.cpp:33:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         if(pos == lis.size()) lis.pb(arr[i]);
      |            ~~~~^~~~~~~~~~~~~
glo.cpp:40:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         if(pos == lis.size()) lis.pb(arr[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