Submission #477277

#	Time	Username	Problem	Language	Result	Execution time	Memory
477277		Shogun3103	Global Warming (CEOI18_glo)	C++17	100 / 100	68 ms	10056 KiB

glo

#include <bits/stdc++.h>
 
using namespace std;

#define ll long long
#define ld long double
#define FOR(i,a,b) for(__typeof(b) i=a; i<=b; i++)
#define FOD(i,a,b) for(__typeof(b) i=b; i>=a; i--)
#define EACH(u, v) for(auto& u : v)
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define ii pair<int,int>
#define iii pair<int,ii>
#define f first
#define s second
#define ed "\n"
#define sp " "
#define vi vector<int>
#define vii vector<ii>
#define vl vector<ll>
#define NO cout << "NO" << ed;
#define YES cout << "YES" << ed;
#define no cout << "no" << ed;
#define yes cout << "yes" << ed;

void setIO(string fileName = ""){
    if(fileName.length()){
        freopen((fileName+".in").c_str(), "r", stdin);
        freopen((fileName+".out").c_str(), "w", stdout);
    }
}

int lnds(vl a)
{
    vi calc;
    for(int q : a) {
        int pos = upper_bound(all(calc), q) - calc.begin();
        if(pos == sz(calc)) calc.pb(q);
        else calc[pos] = q;
    }
    return sz(calc);
}

const int oo1 = 1e9 + 7;
const int oo2 = 1e9 + 9;
const int d4x[] = {0, 0, 1, -1};
const int d4y[] = {1, -1, 0, 0};
const int d8x[] = {-1, 0, 1, -1, 1, -1, 0, 1};
const int d8y[] = {1, 1, 1, 0, 0, -1, -1, -1};
const int N = 2e5 + 10;
const int M = 5e3 + 10;
vi adj[N];

int n, m;
int a[N], x, pre[N];

void solve()
{
    cin >> n >> x;
    FOR(i, 1, n) cin >> a[i];

    //left
    int ans = 0;
    vi dp(n, oo1);
    FOR(i, 1, n) {
        int j = lower_bound(all(dp), a[i]) - dp.begin();
        dp[j] = a[i];
        pre[i] = j + 1;
        ans = max(ans, pre[i]);
    }   
    //right
    dp = vi(n, oo1);
    FOD(i, 1, n) {
        int j = lower_bound(all(dp), -a[i] + x) - dp.begin();
        ans = max(ans, pre[i] + j);
        int jj = lower_bound(all(dp), -a[i]) - dp.begin();
        dp[jj] = -a[i];
    }   
    cout << ans;  
}          

int main()
{ 
    ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);        
    setIO("");
    int t; t = 1;
    //int t; cin >> t;
    FOR(i, 1, t) solve();
    return 0;
}

Compilation message (stderr)

glo.cpp: In function 'void setIO(std::string)':
glo.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen((fileName+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen((fileName+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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