Submission #1091323

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091323		kasdo	Bouquet (EGOI24_bouquet)	C++14	52 / 100	26 ms	12276 KiB

Main

#include "bits/stdc++.h"
using namespace std;
#define int long long
#define endl '\n'
#define speed cin.tie (0) -> sync_with_stdio (0);ios_base::sync_with_stdio(false);cin.tie(0);
const int maxn = 200005;
int n;
int l[maxn], r[maxn];
int dp[maxn];
int rec(int i, int p)
{
    if (i <= 0) return 0;
    if (dp[i] != -1) return dp[i];
    
    int ret = max(rec(i - 1, i), rec(i - l[i] - 1, i) + 1);
    return dp[i] = ret;
}
int rec2(int i)
{
    if (i <= 0) return 0;
    if (dp[i] != -1) return dp[i];
    
    int ret = 1;
    for(int j=1; j<i; j++)
    {
        if (j + r[j] < i && i - l[i] > j) ret = max(ret, rec2(j) + 1);
    }
    return dp[i] = ret;
}
void s1()
{
    for(int i=1; i<=maxn-5; i++) dp[i] = -1;
    cout<<rec(n, 0)<<endl;
}
void s2()
{
    cout<<(n - 1) / (l[1] + 1) + 1<<endl;
}
void s3()
{
    for(int i=1; i<=maxn-5; i++) dp[i] = -1;
    
    rec2(n);
    int ans = 0;
    for(int i=1; i<=n; i++) ans = max(ans, rec2(i));
    cout<<ans<<endl;
}
void solve()
{
    cin>>n;
    
    bool ok = 1;
    for(int i=1; i<=n; i++)
    {
        cin>>l[i]>>r[i];
        ok &= (l[i] == r[i]); ok &= (l[i] == l[1]);
    }
    
    if (n <= 1000) s3();
    else if (ok) s2();
    else s1();
}
signed main ()
{
    speed
    // freopen("feast.in", "r", stdin);
    // freopen("feast.out", "w", stdout);
    
    int _ = 1;
    // cin>>_;
 
    while(_--) solve();
 
    return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 16 / 16
• Subtask 3: 28 / 28
• Subtask 4: 0 / 18
• Subtask 5: 0 / 30