Submission #452039

#	Time	Username	Problem	Language	Result	Execution time	Memory
452039		ljuba	Global Warming (CEOI18_glo)	C++17	100 / 100	70 ms	5288 KiB

glo

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef long double ld;
 
typedef vector<int> vi;
typedef vector<ll> vll;
 
typedef vector<vi> vvi;
typedef vector<vll> vvll;
 
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
typedef vector<pii> vpii;
typedef vector<pll> vpll;
 
typedef vector<vpii> vvpii;
typedef vector<vpll> vvpll;
 
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)(x).size()
#define fi first
#define se second
 
template<class T> bool ckmin(T &a, const T &b) {return a > b ? a = b, 1 : 0;}
template<class T> bool ckmax(T &a, const T &b) {return a < b ? a = b, 1 : 0;}
 
namespace debug {
    void __print(int x) {cerr << x;}
    void __print(long long 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 string &x) {cerr << '\"' << x << '\"';}
    void __print(const char *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 z : x) cerr << (f++ ? "," : ""), __print(z); cerr << "}";}
    void _print() {cerr << "]\n";}
    template <typename T, typename... V>
    void _print(T t, V... v) {__print(t); if(sizeof...(v)) cerr << ", "; _print(v...);}
 
#ifdef ljuba
#define dbg(x...) cerr << "\e[91m" << "LINE(" << __LINE__ << ") -> " << "[" << #x << "] = ["; _print(x)
#else
#define dbg(x...)
#endif
}
 
using namespace debug;
 
const char nl = '\n';
 
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
 
/*
погледај сампле тестове, пре него што имплементираш (можда имаш погрешну идеју) 
уместо да разматраш неке глупе случајеве на папиру, размишљај заправо о задатку
*/

void solve() {
    int n, x;
    cin >> n >> x;
    vi v(n);
    for(auto &z : v)
        cin >> z;

    //4 100
    //1 2 2 1

    vi odg(n);
    vi dp;

    for(int i = 0; i < n; ++i) {
        auto it = lower_bound(all(dp), v[i]+x);
        if(it == dp.begin()) {
            odg[i] = 1;
        } else {
            --it;
            odg[i] = (it-dp.begin()+2);
        }
        it = lower_bound(all(dp), v[i]);
        if(it == dp.end()) {
            dp.pb(v[i]);
        } else {
            *it = v[i];
        }
        dbg(i, dp);
    }

    dbg(odg);

    int ans = 0;
    dp.clear();
    vi suf;

    //suf treba da bude 1 0 0 0

    for(int i = n-1; ~i; --i) {
        auto it = lower_bound(all(dp), -v[i]);
        int res = odg[i];

        if(it == dp.begin()) {
            res += 0;
            suf.pb(0);
        } else {
            --it;
            int bruh = (it-dp.begin()+1);
            suf.pb(bruh);
            res += bruh;
        }

        ckmax(ans, res);

        it = lower_bound(all(dp), -v[i]);
        if(it == dp.end()) {
            dp.pb(-v[i]);
        } else {
            *it = -v[i];
        }
    }

    reverse(all(suf));
    dbg(suf);

    cout << ans << nl;
}
 
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
    int testCases = 1;
    //cin >> testCases;
    while(testCases--)
        solve();
}

• 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