Submission #699728

#	Time	Username	Problem	Language	Result	Execution time	Memory
699728		bLIC	Global Warming (CEOI18_glo)	C++17	100 / 100	56 ms	6188 KiB

glo

/**
 *  Author: Anil Byar
**/

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>

// using namespace __gnu_pbds;
using namespace std;

// template<class T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;



#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define ft first
#define sd second
#define pb push_back

// Source: https://codeforces.com/blog/entry/68809
// { start
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// } end


typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<vl> vvl;

#define dbg if(0)

const ll MOD = 998244353;
const ll INFLL = 1e18+5;
const int INF = 1e9;
const int maxN = 101;
const int maxK = 8001;

void printbit(int x, int len) {string s="\n";while(len--){s=((x%2)?'1':'0')+s;x/=2;} cout<<s;}
ll power(ll x, ll y){if (y==0) return 1;ll ret = power(x, y/2);ret *= ret;ret%=MOD;if (y&1) ret *= x;return ret%MOD;}
ll modinv(ll x, ll mod = MOD) {return power(x, mod-2);}

template<class T>
istream& operator>>(istream&in, vector<T>&v){
    for (T& x:v) in>>x;
    return in;
}
template<class T>
ostream& operator<<(ostream&out, vector<T>&v){
    for (T& x:v) out<<x<<' ';
    cout<<'\n';
    return out;
}


void solve(){
    int n, x;cin>>n>>x;
    vi a(n);
    cin>>a;
    vi dec(n, -1);
    vi declen(n, -1);
    {
        vi b = a;
        vi tmp(n, -INF);
        int lst = n-1;
        for (int i = n-1;i>=0;i--){// 2 4 7 // 3
            {
                int pos = upper_bound(all(tmp), b[i]-x) - tmp.begin() - 1;
                declen[i] = n-pos;  
            }
            int pos = upper_bound(all(tmp), b[i]) - tmp.begin() - 1;
            if (tmp[pos]==-1) lst = pos;
            tmp[pos] = b[i];
            dec[i] = tmp[lst];
        }
    }
    vi inc(n, INF);
    vi inclen(n, 0);
    int lst = 0;
    for (int i= 0;i<n;i++){
        int pos = lower_bound(all(inc), a[i])-inc.begin();
        if (inc[pos]==INF) lst = pos;
        inc[pos] = a[i];
        inclen[i] =  pos+1;
        // 1 2 3 3 4 5 // x = 0
    }
    // debug(declen);
    int ans = 0;
    for (int i = 0;i<n;i++){
        ans = max(ans, inclen[i] + declen[i] - 1);
    }
    cout<<ans;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

// #define _DEBUG
#ifdef _DEBUG
    freopen("input.in", "r", stdin);
    freopen("output.out", "w", stdout);
    int tt = clock();
#endif

    int t=1, i = 1;
    // cin>>t;
    while(t--){
        // cout<<"Case #"<<i++<<": ";
        solve();
        cout<<'\n';
    }
#ifdef _DEBUG
    cerr << "TIME = " << (float)(clock() - tt)/CLOCKS_PER_SEC << endl;
    tt = clock();
#endif
}

Compilation message (stderr)

glo.cpp: In function 'void solve()':
glo.cpp:114:9: warning: variable 'lst' set but not used [-Wunused-but-set-variable]
  114 |     int lst = 0;
      |         ^~~
glo.cpp: In function 'int main()':
glo.cpp:142:14: warning: unused variable 'i' [-Wunused-variable]
  142 |     int t=1, i = 1;
      |              ^

• 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