제출 #1183743

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1183743		swishy123	Global Warming (CEOI18_glo)	C++20	10 / 100	138 ms	6472 KiB

glo

#include <iostream>
#include <algorithm>
#include <vector>
#include <random>
#include <chrono>
#include <set>
#include <map>
#include <stack>
#include <functional>
#include <iomanip>
#include <queue>
#include <cassert>
#include <complex>
#include <cstring>
#include <memory>
#include <bitset>
#include <sstream>
#include <cmath>
#include <numeric>
#include <numbers>
#include <fstream>

using namespace std;

#ifndef template
#ifndef define
 
#define ll long long
#define ld long double
#define pl pair<ll, ll>
#define pi pair<int, int>
#define nl cout << '\n';
#define x first
#define y second 
#define cbit(x) __builtin_popcountll(x)
#define uid(a, b) uniform_int_distribution<ll>(a, b)(rng) 
#define siz(x) (int)x.size()
 
#endif
 
#ifndef print
void print(size_t x) {cout << x << ' ';}
void print(int x) {cout << x << ' ';}
void print(long long x) {cout << x << ' ';}
void print(float x) {cout << x << ' ';}
void print(long double x) {cout << x << ' ';}
void print(char x) {cout << x << ' ';}
void print(const char* x) {cout << x << ' ';}
void print(bool x) {cout << x << ' ';}
void print(string &x) {cout << x << ' ';}
 
template<typename T, typename V>
void print(pair<T, V> &p) {print(p.x); print(p.y);}
template<typename T>
void print(vector<T> v) {for (int i = 0; i < v.size(); i++) print(v[i]);}
template<typename T>
void print(vector<vector<T>> v) {
    for (int i = 0; i < v.size(); i++){
        for (int j = 0; j < v[i].size(); j++)
            print(v[i][j]);
        nl;
    }
}
template <typename T, typename... V>
void print(T t, V&&... v) {print(t); print(v...);}
 
#endif
 
#ifndef read
void read(int &x) {cin >> x;}
void read(long long &x) {cin >> x;}
void read(unsigned &x) {cin >> x;}
void read(unsigned long long &x) {cin >> x;}
void read(float &x) {cin >> x;}
void read(long double &x) {cin >> x;}
void read(char &x) {cin >> x;}
void read(string &x) {cin >> x;}
void read(bool &x) {cin >> x;}
 
template<typename T> 
void read(vector<T> &v) {
    for (int i = 0; i < v.size(); i++)
        read(v[i]);
}
template <typename T, typename... V>
void read(T &t, V&... v) {read(t); read(v...);}
#endif
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> bool maxi(T& a, const T& b) {
    return a < b ? a = b, 1 : 0;
}
template<class T> bool mini(T& a, const T& b) {
    return a > b ? a = b, 1 : 0;
}
template<class... Args>
auto vec(size_t n, Args&&... args) {
    if constexpr(sizeof...(args) == 1)
        return vector(n, args...);
    else
        return vector(n, vec(args...));
}

#endif

using namespace std;
const ll inf = 1e15;
const ll def = 1e7+1;
const ll mod = 998244353;

/*
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chimpanzini bananini wah wah wah

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tralalero tralala
*/

template<typename T>
struct SegmentTreeFast{
    vector<T> a;
    T defv;
    int n;

    SegmentTreeFast(int n, T defv) : n(n), defv(defv){
        a = vector<T>(2 * n, defv);
    }

    T cmb(T a, T b){ //change if needed
        return max(a, b);
    }

    void build(){ //array is at i + n index
        for (int i = n - 1; i > 0; --i) 
            a[i] = cmb(a[i << 1], a[i << 1 | 1]);
    } 

    void update(int i, T v){
        T val = a[i + n];
        for (a[i += n] = max(v, val); i > 1; i >>= 1)
            a[i >> 1] = cmb(a[i], a[i ^ 1]);
    }

    T get(int l, int r){
        r++;
        T res = defv;
        for (l += n, r += n; l < r; l >>= 1, r >>= 1){
            if (l&1) res = cmb(res, a[l++]);
            if (r&1) res = cmb(res, a[--r]);
        }

        return res;
    }
};

int pos(vector<int> &v, int x){
    return lower_bound(v.begin(), v.end(), x) - v.begin();
}

void solve(){  
    int n, x;
    read(n, x);

    auto a = vec(n, 0);
    read(a);
    auto v = a;

    sort(v.begin(), v.end());
    auto dp1 = vec(n, 1);

    SegmentTreeFast<int> st(n, 0);
    for (int i = 0; i < n; i++){
        int u = pos(v, a[i]);
        if (u)
            maxi(dp1[i], st.get(0, u - 1) + 1);
        st.update(u, dp1[i]);
    }

    auto dp2 = vec(n, 0);
    st = SegmentTreeFast<int>(n, 0);

    int res = *max_element(dp1.begin(), dp1.end());
    for (int i = n - 1; i >= 0; i--){
        int u = pos(v, a[i]);
        if (u + 1 < n)
            maxi(dp2[i], st.get(u + 1, n - 1) + 1);
        st.update(u, dp2[i]);
        if (i > 0){
            int u = pos(v, a[i - 1] - x);
            if (u + 1 < n)
                maxi(res, dp1[i - 1] + st.get(u + 1, n - 1));
        }
    }
    print(res);
}       

/*
*/

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if (ifstream("input.txt").good()){
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    }

    int t;  
    t = 1;

    while (t--){
        solve();
        nl;
    }
}

컴파일 시 표준 에러 (stderr) 메시지

glo.cpp: In function 'int32_t main()':
glo.cpp:307:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  307 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:308:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  308 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25