Submission #1108669

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108669		cpptowin	Paths (RMI21_paths)	C++17	36 / 100	1052 ms	61004 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 1000010
#define N 2010
#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;
}
vii ke[maxn];
int n,k;
namespace sub4 
{
    int f[N],pos[N];
    int cc = 0;
    int topo[N];
    int h[N],par[N][11];
    void dfs(int u) 
    {
        pos[u] = ++cc;
        topo[cc] = u;
        for(auto [v,w] : ke[u]) if(v != par[u][0]) 
        {
            par[v][0] = u;
            h[v] = h[u] + 1;
            fo(i,1,10) par[v][i] = par[par[v][i - 1]][i - 1];
            f[v] = f[u] + w;
            dfs(v);
        }
    }
    int lca(int u, int v)
    {
        if (h[u] < h[v])
            swap(u, v);
        int del = h[u] - h[v];
        fod(i, 10, 0) if (bit(del, i)) u = par[u][i];
        if (u == v)
            return u;
        fod(i, 10, 0) if (par[u][i] != par[v][i]) u = par[u][i], v = par[v][i];
        return par[u][0];
    }
    void solve()
    {
        fo(i,1,n)
        {
            int ans = 0;
            memset(f,0,sizeof f);
            cc = 0;
            memset(h,0,sizeof h);
            memset(par,0,sizeof par);
            memset(pos,0,sizeof pos);
            memset(topo,0,sizeof topo);
            dfs(i);
            int cnt = k;
            priority_queue<pii> q;
            fo(i,1,n) if(ss(ke[i]) == 1) 
            {
                q.push({f[i],i});
            }
            set<int> st;
            while(cnt > 0 and ss(q))
            {
                auto [du,u] = q.top();
                q.pop();
                auto it = st.lower_bound(pos[u]);
                int val = f[u];
                if(it != st.begin())
                {
                    auto it1 = prev(it);
                    minimize(val,f[u] - f[lca(topo[*it1],u)]);
                }
                if(it != st.end())
                {
                    minimize(val,f[u] - f[lca(topo[*it],u)]);
                }
                if(val >= q.top().fi) 
                {
                    ans += val;
                    st.insert(pos[u]);
                    cnt--;
                }
                else q.push({val,u});
            }
            cout << ans;en;
        }
    }
}
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 >> k;
    fo(i,1,n - 1) 
    {
        int u,v,w;
        cin >> u >> v >> w;
        ke[u].pb(v,w);
        ke[v].pb(u,w);
    }
    sub4::solve();
}

Compilation message (stderr)

Main.cpp:136:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  136 | main()
      | ^~~~
Main.cpp: In function 'int main()':
Main.cpp:141:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  141 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:142:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 11 / 11
• Subtask 3: 17 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 12
• Subtask 6: 0 / 32