제출 #518469

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
518469		Yazan_Alattar	Global Warming (CEOI18_glo)	C++14	100 / 100	623 ms	74944 KiB

glo

#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <algorithm>
#include <set>
#include <map>
#include <queue>
#include <list>
#include <utility>
#include <cmath>
#include <numeric>
#include <assert.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(x) x.begin(), x.end()
const int M = 300007;
const ll inf = 1e9;
const ll mod = 1e9 + 7;
const double pi = acos(-1);
const int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};


int n, x, a[M], pref[M], suf[M], last[M], seg[32 * M], L[32 * M], R[32 * M], ans, nodesNum = 1;
map <int,int> lastocur;

void upd(int pos, int v, int node = 1, int l = 1, int r = 1e9 + 1)
{
    if(l == r){
        seg[node] = v;
        return;
    }
    int mid = (l + r) / 2;
    if(pos <= mid){
        if(!L[node]) L[node] = ++nodesNum;
        upd(pos, v, L[node], l, mid);
   }
    else{
        if(!R[node]) R[node] = ++nodesNum;
        upd(pos, v, R[node], mid + 1, r);
    }
    seg[node] = max(seg[L[node]], seg[R[node]]);
    return;
}

int get(int st, int en, int node = 1, int l = 1, int r = 1e9 + 1)
{
    if(l > en || r < st) return -inf;
    if(l >= st && r <= en) return seg[node];
    if(!L[node]) L[node] = ++nodesNum;
    if(!R[node]) R[node] = ++nodesNum;
    int mid = (l + r) / 2;
    return max(get(st, en, L[node], l, mid), get(st, en, R[node], mid + 1, r));
}

int main()
{
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> x;
    for(int i = 1; i <= n; ++i) cin >> a[i];
    vector <int> lis;
    for(int i = 1; i <= n; ++i){
        int it = lower_bound(all(lis), a[i]) - lis.begin();
        if(it == lis.size()) lis.pb(a[i]);
        else lis[it] = a[i];
        pref[i] = it + 1;
    }
    ans = lis.size();
    lis.clear();
    for(int i = n; i; --i){
        int it = lower_bound(all(lis), - a[i]) - lis.begin();
        if(it == lis.size()) lis.pb(-a[i]);
        else lis[it] = -a[i];
        suf[i] = it  + 1;
        upd(a[i], it + 1);
        if(lastocur[a[i]]) last[i] = lastocur[a[i]];
        lastocur[a[i]] = i;
    }
    for(int i = 1; i <= n; ++i){
        upd(a[i], suf[last[i]]);
        ans = max(ans, pref[i] + get(max(1, a[i] - x + 1), 1e9 + 1));
    }
    cout << ans << endl;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

glo.cpp: In function 'int main()':
glo.cpp:68:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |         if(it == lis.size()) lis.pb(a[i]);
      |            ~~~^~~~~~~~~~~~~
glo.cpp:76:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |         if(it == lis.size()) lis.pb(-a[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