Submission #535000

#	Time	Username	Problem	Language	Result	Execution time	Memory
535000		Killer2501	Self Study (JOI22_ho_t2)	C++14	100 / 100	253 ms	17808 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define pb push_back
#define pll pair<ll, int>
#define pii pair<int, int>
#define fi first
#define se second
using namespace std;
const int N = 3e5+5;
const int M = 8;
const int mod = 998244353;
const int base = 350;
const ll inf = 1e18+7;
int m, n, k, t, c[N],  d[N], dp[N][3], L, R, in[N], out[N], pos[N];
ll ans, tong, b[N], a[N];
vector<int> adj[N];
string s;
int r, sz, ntime;
struct BIT
{
    int n;
    vector<int> fe;
    BIT(){}
    void init(int _n)
    {
        n = _n;
        fe.assign(n+1, 0);
    }
    void add(int id, int x)
    {
        ++id;
        for(; id <= n; id += id & -id)fe[id] += x;
    }
    int get(int id)
    {
        ++id;
        id = min(id, n);
        if(id <= 0)return 0;
        int total = 0;
        for(; id; id -= id & -id)total += fe[id];
        return total;
    }
    int get(int l, int r)
    {
        return get(r) - get(l-1);
    }
}bit[3];
void dfs(int u, int p = 0)
{
    int mx = 0;
    d[u] = 1;
    for(int v: adj[u])
    {
        if(v == p || b[v])continue;
        dfs(v, u);
        d[u] += d[v];
        mx = max(d[v], mx);
    }
    mx = max(mx, sz-d[u]);
    if(mx*2 <= sz)r = u;
}
void cal(int u,  int p = 0)
{
    if(L <= c[u] && c[u] <= R)++ans;
    in[u] = ++ntime;
    pos[ntime] = u;
    for(int v: adj[u])
    {
        if(v == p || b[v])continue;
        c[v] = c[u];
        if(p && a[u] > a[p] && a[u] > a[v])++c[v];
        cal(v, u);
    }
    out[u] = ntime;
}
void decom(int u)
{
    //cout << u << endl;
    int all = sz;
    b[u] = 1;
    ntime = 0;
    c[u] = 0;
    cal(u);
    //cout << u << '\n';
    //for(int j = in[u]; j <= out[u]; j ++)cout << pos[j] <<" "<< c[pos[j]] << '\n';
    for(int v: adj[u])
    {
        if(b[v])continue;
        if(a[v] < a[u])
        {
            for(int j = in[v]; j <= out[v]; j ++)
            {
                int x = pos[j];
                ans += bit[0].get(L-c[x], R-c[x]);
                ans += bit[1].get(L-c[x]-1, R-c[x]-1);
            }
            for(int j = in[v]; j <= out[v]; j ++)
            {
                int x = pos[j];
                bit[1].add(c[x], 1);
            }
        }
        else
        {
            for(int j = in[v]; j <= out[v]; j ++)
            {
                int x = pos[j];
                ans += bit[0].get(L-c[x], R-c[x]);
                ans += bit[1].get(L-c[x], R-c[x]);
            }
            for(int j = in[v]; j <= out[v]; j ++)
            {
                int x = pos[j];
                bit[0].add(c[x], 1);
            }
        }
    }
    for(int v: adj[u])
    {
        if(b[v])continue;
        if(a[v] < a[u])
        {
            for(int j = in[v]; j <= out[v]; j ++)
            {
                int x = pos[j];
                bit[1].add(c[x], -1);
            }
        }
        else
        {
            for(int j = in[v]; j <= out[v]; j ++)
            {
                int x = pos[j];
                bit[0].add(c[x], -1);
            }
        }
    }
    for(int v: adj[u])
    {
        if(b[v])continue;
        sz = d[v] > d[u] ? all-d[u] : d[v];
        dfs(v);
        decom(r);
    }
}
void sol()
{
    cin >> n >> m;
    for(int i = 1; i <= n; i ++)cin >> a[i];
    for(int i = 1; i <= n; i ++)cin >> b[i];
    ll l = 1, r = inf, mid;
    while(l <= r)
    {
        mid = (l+r)>>1;
        ll need = 0, have = 0;
        for(int i = 1; i <= n; i ++)
        {
            if(a[i] >= b[i])
            {
                if(a[i]*m >= mid)have += m-(mid+a[i]-1)/a[i];
                else need += (mid-a[i]*m+b[i]-1)/b[i];
            }
            else
            {
                if(b[i]*m >= mid)have += m-(mid+b[i]-1)/b[i];
                else need += (mid-b[i]*m+b[i]-1)/b[i];
            }
            if(need > 1ll*n*m)break;
        }
        if(have >= need)l = mid+1;
        else r = mid-1;
    }
    cout << r;
}
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:184:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  184 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:185:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  185 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29
• Subtask 5: 9 / 9