Submission #1109546

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109546		cpptowin	Traffickers (RMI18_traffickers)	C++17	100 / 100	1342 ms	141268 KiB

traffickers

#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 60010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define int long long
#define inf (int)1e18
#define bitcount(x) __builtin_popcountll(x)
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1LL << j))
#define onbit(i, j) (i | (1LL << j))
#define vi vector<int>
#define all(x) x.begin(), x.end()
#define ss(x) (int)x.size()
#define UNIQUE(v) v.erase(unique(all(v)),v.end())
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}
using namespace std;
const int nsqrt = 450;
const int mod = 1e9 + 7;
void add(int &x, int k)
{
    x += k;
    x %= mod;
    if(x < 0) x += mod;
}
void del(int &x, int k)
{
    x -= k;
    x %= mod;
    if(x < 0) x += mod;
}
struct BIT
{
    int t[maxn];
    void up(int x,int val)
    {
        for( ; x < maxn; x += lb(x)) t[x] += val;
    }
    int get(int x)
    {
        int ans = 0;
        for( ; x ; x -= lb(x)) ans += t[x];
        return ans;
    }
}t[21][21];
vi ke[maxn];
int n;
int pos[maxn],tail[maxn];
int cnt;
int par[maxn][16];
int h[maxn];
void dfs(int u)
{
    pos[u] = ++cnt;
    for(int v : ke[u]) if(v != par[u][0])
    {
        h[v] = h[u] + 1;
        par[v][0] = u;
        fo(i,1,15) par[v][i] = par[par[v][i - 1]][i - 1];
        dfs(v);
    }
    tail[u] = ++cnt;
}
int lca(int u, int v)
{
    if (h[u] < h[v])
        swap(u, v);
    int del = h[u] - h[v];
    fod(i, 15, 0) if (bit(del, i)) u = par[u][i];
    if (u == v)
        return u;
    fod(i, 15, 0) if (par[u][i] != par[v][i]) u = par[u][i], v = par[v][i];
    return par[u][0];
}
void update(int u,int v,int val)
{
    int x = lca(u,v);
    vi node;
    while(u != x)
    {
        node.pb(u);
        u = par[u][0];
    }
    node.pb(x);
    vi node1;
    while(v != x)
    {
        node1.pb(v);
        v = par[v][0];
    }
    reverse(all(node1));
    for(int it : node1) node.pb(it);
    int d = ss(node);
    fo(i,0,d - 1)
    {
        int it = node[i];
        t[d][i].up(pos[it],val);
        t[d][i].up(tail[it] + 1,-val);
    }
}
int get(int u,int tt)
{
    int ans = 0;
    fo(d,1,20)
    {
        fo(r,0,d - 1)
        {
            int x = t[d][r].get(pos[u]);
            ans += x * (tt / d) + x * (tt % d >= r);
        }
    }
    return ans;
}
int get(int u,int v,int t)
{
    int l = lca(u,v);
    return get(u,t) + get(v,t) - get(l,t) - get(par[l][0],t);
}
main()
{
#define name "TASK"
    if (fopen(name ".inp", "r"))
    {
        freopen(name ".inp", "r", stdin);
        freopen(name ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    fo(i,1,n - 1)
    {
        int u,v;
        cin >> u >> v;
        ke[u].pb(v);
        ke[v].pb(u);
    }
    dfs(1);
    int m;cin >> m;
    fo(i,1,m)
    {
        int u,v;
        cin >> u >> v;
        update(u,v,1);
    }
    int q;cin >> q;
    while(q--)
    {
        int ty;
        cin >> ty;
        if(ty <= 2)
        {
            int u,v;
            cin >> u >> v;
            int val = (ty == 1 ? 1 : -1);
            update(u,v,val);
        }
        else
        {
            int u,v,l,r;
            cin >> u >> v >> l >> r;
            cout << get(u,v,r) - get(u,v,l - 1);en;
        }
    }
}

Compilation message (stderr)

traffickers.cpp:145:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  145 | main()
      | ^~~~
traffickers.cpp: In function 'int main()':
traffickers.cpp:150:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  150 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
traffickers.cpp:151:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  151 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 40 / 40