Submission #1124609

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124609		cpptowin	Petrol stations (CEOI24_stations)	C++20	55 / 100	159 ms	98384 KiB

Main

#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 100010
#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;
int n,k;
vii ke[maxn];
int res[maxn];
namespace sub1
{
int sz[maxn];
void dfs1(int u,int par = 0)
{
    sz[u] = 1;
    for(auto [v,_] : ke[u]) if(v != par)
        {
            dfs1(v,u);
            sz[u] += sz[v];
        }
}
void dfs(int u,int par,int now)
{
    for(auto [v,w] : ke[u]) if(v != par)
        {
            if(now < w) res[u] += sz[v],dfs(v,u,k - w);
            else dfs(v,u,now - w);
        }
}
void solve()
{
    fo(i,1,n)
    {
        dfs1(i);
        dfs(i,i,k);
        fo(i,1,n) sz[i] = 0;
    }
    fo(i,1,n) cout << res[i] << "\n";
}
}
namespace sub3
{
deque<array<int,4>> q;
int tot = 0;
int del;
void dfs(int u,int par,int id)
{
    for(auto [v,w] : ke[u]) if(v != par)
        {
            int cnt = 0;
            tot += w;
            int sum = 1;
            while(ss(q))
            {
                auto [dist,val,pos,sl] = q.front();
                if(dist >= tot) break;
                q.pop_front();
                sum += sl;
                cnt += val - (id - pos) * sl;
            }
            res[u] += cnt;
            q.push_back({k + tot - w,n - id + cnt,id,sum});
            dfs(v,u,id + 1);
        }
}
void solve()
{
    fo(i,1,n) if(ss(ke[i]) == 1)
    {
        tot = 0;
        q.clear();
        del = 0;
        dfs(i,i,1);
    }
    fo(i,1,n) cout << res[i] << "\n";
}
}
namespace sub5
{
int up[maxn][15],down[maxn][15];
int sz[maxn];
void dfs(int u,int par = 0)
{
    sz[u] = 1;
    for(auto [v,w] : ke[u]) if(v != par)
        {
            dfs(v,u);
            sz[u] += sz[v];
        }
}
void dfsup(int u,int par = 0)
{
    up[u][k]++;
    for(auto [v,w] : ke[u]) if(v != par)
        {
            dfsup(v,u);
            fo(i,0,k)
            {
                if(i < w)
                {
                    res[v] += up[v][i] * (n - sz[v]);
//                    if(up[v][i])
//                    {
//                        cout << v << ' ' << i << ' ' << up[v][i] << ' ' << (n - sz[v]) << "\n";
//                    }
                    up[u][k - w] += up[v][i];
                }
                else up[u][i - w] += up[v][i];
            }
        }
}
void dfsdown(int u,int par = 0)
{
    vector<vi> pre(ss(ke[u]) + 2,vi(k + 1,0)),suf(ss(ke[u]) + 2,vi(k + 1,0));
    down[u][k]++;
    fo(i,1,ss(ke[u]))
    {
        auto [v,w] = ke[u][i - 1];
        fo(j,0,k) pre[i][j] = pre[i - 1][j];
        if(v == par) continue;
        fo(j,0,k)
        {
            if(j < w) pre[i][k - w] += up[v][j];
            else pre[i][j - w] += up[v][j];
        }
    }
    fod(i,ss(ke[u]),1)
    {
        auto [v,w] = ke[u][i - 1];
        fo(j,0,k) suf[i][j] = suf[i + 1][j];
        if(v == par) continue;
        fo(j,0,k)
        {
            if(j < w) suf[i][k - w] += up[v][j];
            else suf[i][j - w] += up[v][j];
            if(j < w)
            {
                down[v][k - w] += pre[i -1][j] + suf[i + 1][j] + down[u][j];
                int val = (pre[i - 1][j] + suf[i + 1][j] + down[u][j]) * sz[v];
                res[u] += (pre[i - 1][j] + suf[i + 1][j] + down[u][j]) * sz[v];
            }
            else down[v][j - w] += pre[i - 1][j] + suf[i + 1][j] + down[u][j];
        }
        dfsdown(v,u);
    }
}
void solve()
{
    dfs(1);
    dfsup(1);
    dfsdown(1);
    fo(i,1,n) cout << res[i] << "\n";
}
}
main()
{
#define name "stations"
    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 >> k;
    bool sub3 = 1;
    fo(i,1,n - 1)
    {
        int u,v,w;
        cin >> u >> v >> w;
        u++,v++;
        if(w != 1) sub3 = 0;
        ke[u].pb(v,w);
        ke[v].pb(u,w);
    }
    if(n <= N) sub1::solve();
    else if(sub3) sub3::solve();
    else sub5::solve();
}

Compilation message (stderr)

Main.cpp:194:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  194 | main()
      | ^~~~
Main.cpp: In function 'int main()':
Main.cpp:199:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  199 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:200:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  200 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 18 / 18
• Subtask 2: 8 / 8
• Subtask 3: 0 / 10
• Subtask 4: 12 / 12
• Subtask 5: 17 / 17
• Subtask 6: 0 / 35