Submission #529713

#	Time	Username	Problem	Language	Result	Execution time	Memory
529713		Killer2501	Financial Report (JOI21_financial)	C++14	100 / 100	576 ms	53956 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define pb push_back
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 5e5+5;
const int M = 5e3+5;
const int mod = 1e9+7;
const ll base = 75;
const int inf = 1e9+7;
int m, n, t, b[N], c[N], d[N], cnt, ntime, id[N];
int dp[N], k, a[N];
int ans, tong;
vector<int> adj[N];
vector<pii> g[N];
vector<pii> kq;
string s;
bool vis[N];
ll pw(ll k, ll n)
{
    ll total = 1;
    for(; n; n >>= 1)
    {
        if(n&1)total = total * k % mod;
        k = k * k % mod;
    }
    return total;
}
vector<pll> vi;
struct IT
{
    int n;
    vector<int> st;
    IT(int _n)
    {
        n = _n;
        st.resize(n*4+4, 0);
    }
    void build(int id, int l, int r, int pos, int x)
    {
        if(l == r)
        {
            st[id] = x;
            return;
        }
        int mid = (l+r)>>1;
        if(pos <= mid)build(id<<1, l, mid, pos, x);
        else build(id<<1|1, mid+1, r, pos, x);
        st[id] = max(st[id<<1], st[id<<1|1]);
    }
    void build(int pos, int x)
    {
        build(1, 1, n, pos, x);
    }
    int get(int id, int l, int r, int u, int v)
    {
        if(u <= l && r <= v)return st[id];
        if(u > r || l > v)return 0;
        int mid = (l+r)>>1;
        return max(get(id<<1, l, mid, u, v), get(id<<1|1, mid+1, r, u, v));
    }
    int get(int l, int r)
    {
        return get(1, 1, n, l, r);
    }
};
struct DSU
{
    int n;
    vector<int> lab, mn;
    DSU(int _n)
    {
        n = _n;
        lab.resize(n+1, -1);
        mn.resize(n+1);
        for(int i = 0; i <= n; i ++)mn[i] = i;
    }
    int findp(int u)
    {
        return lab[u] < 0 ? u : lab[u] = findp(lab[u]);
    }
    void hop(int u, int v)
    {
        u = findp(u);
        v = findp(v);
        if(u == v)return;
        if(lab[u] > lab[v])swap(u, v);
        lab[u] += lab[v];
        lab[v] = u;
        mn[u] = min(mn[u], mn[v]);
    }
};
pll p[N];
void sol()
{
    cin >> n >> k;
    for(int i = 1; i <= n; i ++)
    {
        cin >> p[i].fi;
        p[i].se = i;
    }
    sort(p+1, p+1+n);
    set<int> pos;
    IT st(n);
    DSU dsu(n);
    for(int i = 1; i <= n; )
    {
        int j = i;
        while(i <= n && p[i].fi == p[j].fi)
        {
            auto it = pos.lower_bound(p[i].se);
            if(it != pos.begin())
            {
                --it;
                if(p[i].se-(*it) <= k)
                    a[i] = st.get(dsu.mn[dsu.findp(*it)], p[i].se)+  1;
                else a[i] = 1;
            }
            else a[i] = 1;
            ans = max(ans, a[i]);
            //cout << p[i].se <<" "<<p[i].fi<<" "<<a[i] << '\n';
            ++i;
        }
        for(int x = j; x < i; x ++)
        {
            st.build(p[x].se, a[x]);
            auto it = pos.lower_bound(p[x].se);
            if(it != pos.end() && (*it)-p[x].se <= k)dsu.hop(p[x].se, (*it));
            if(it != pos.begin())
            {
                --it;
                if(p[x].se-(*it) <= k)dsu.hop(p[x].se, (*it));
            }
            pos.insert(p[x].se);
        }
    }
    cout << ans;
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    #define task "test"
    if(fopen(task".inp", "r"))
	{
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
    int test = 1;
    //cin >> test;
    while(test -- > 0)sol();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:152:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  152 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:153:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  153 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 12 / 12
• Subtask 5: 5 / 5
• Subtask 6: 35 / 35