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답안 #643369

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
643369 2022-09-21T22:27:28 Z danikoynov Paths (RMI21_paths) C++14
36 / 100
 600 ms 24956 KB 
#include<bits/stdc++.h>

using namespace std;
typedef long long ll;

const int maxn = 1e5 + 10;

int n, k, par[maxn], used[maxn], rev_idx[maxn];
ll depth[maxn];
vector < pair < int, ll > > g[maxn], sg[maxn];

int timer, f[maxn], in[maxn], out[maxn];
void trav(int v, int p)
{
    par[v] = p;
    in[v] = ++ timer;
    f[timer] = v;
    for (int i = 0; i < g[v].size(); i ++)
    {
        pair < int, ll > nb = g[v][i];
        if (nb.first == p)
            continue;
        rev_idx[nb.first] = i;
        trav(nb.first, v);
    }
    out[v] = timer;
}


void calc(int v)
{
    for (int i = 0; i < g[v].size(); i++)
    {
        pair < int, ll > nb = g[v][i];
        if (nb.first == par[v])
            continue;
        depth[nb.first] = depth[v] + nb.second;
        calc(nb.first);
    }
}

pair < ll, int > tree[4 * maxn];
ll lazy[4 * maxn];

void build_tree(int root, int left, int right)
{
    lazy[root] = 0;
    if (left == right)
    {
        tree[root] = {depth[f[left]], f[left]};
        return;
    }

    int mid = (left + right) / 2;
    build_tree(root * 2, left, mid);
    build_tree(root * 2 + 1, mid + 1, right);

    tree[root] = max(tree[root * 2], tree[root * 2 + 1]);

}


void push_lazy(int root, int left, int right)
{
    ///cout << root << " ::: " << lazy[root] << endl;
    tree[root].first += lazy[root];

    if (left != right)
    {
        lazy[root * 2] += lazy[root];
        lazy[root * 2 + 1] += lazy[root];
    }

    lazy[root] = 0;
}

void update(int root, int left, int right, int qleft, int qright, ll val)
{


    push_lazy(root, left, right);
///cout << root << " " << left << " " << right << " " << qleft << " " << qright << " " << val << endl;
    if (left > qright || right < qleft)
        return;

    if (left >= qleft && right <= qright)
    {
        lazy[root] += val;
        push_lazy(root, left, right);
        return;
    }

    int mid = (left + right) / 2;
    update(root * 2, left, mid, qleft, qright, val);
    update(root * 2 + 1, mid + 1, right, qleft, qright, val);
    ///cout << root << " " << left << " " << right << " " << qleft << " " << qright << " " << val << endl;
    tree[root] = max(tree[root * 2], tree[root * 2 + 1]);
}

pair < ll, int > query(int root, int left, int right, int qleft, int qright)
{

    push_lazy(root, left, right);
///cout << root << " " << left << " " << right << " ::: " << tree[root].first << endl;
    if (left > qright || right < qleft)
        return {(ll)-1, -1};

    if (left >= qleft && right <= qright)
        return tree[root];

    int mid = (left + right) / 2;
    return max(query(root * 2, left, mid, qleft, qright),
               query(root * 2 + 1, mid + 1, right, qleft, qright));
}
int fver;
void clean(int v)
{
    while(!used[v])
    {
        ///cout << "rem " << v << " " << in[v] << " " << out[v] << endl;
        used[v] = 1;
        update(1, 1, n, in[v], out[v], - g[par[v]][rev_idx[v]].second);
        g[par[v]][rev_idx[v]].second = 0;
        v = par[v];
    }
}

void solve()
{
    cin >> n >> k;
    for (int i = 1; i < n; i ++)
    {
        int v, u;
        ll l;
        cin >> v >> u >> l;
        g[v].push_back({u, l});
        sg[v].push_back({u, l});
        g[u].push_back({v, l});
        sg[u].push_back({v, l});
    }


    for (int ver = 1; ver <= n; ver ++)
    {
        fver = ver;
        for (int i = 1; i <= n; i ++)
            g[i] = sg[i], used[i] = 0;

        timer = 0;
        trav(ver, -1);
        /**for (int i = 1; i <= n; i ++)
            cout << f[i] << " ";
        cout << endl;*/
        depth[ver] = 0;
        calc(ver);
        build_tree(1, 1, n);
        ///update(1, 1, n, 2, 11, -2);
        ///cout << query(1, 1, n, 8, 8).first << endl;
        ///exit(0);
        ll ans = 0;
        used[ver] = 1;
        for (int i = 1; i <= k; i ++)
        {
            int mx = tree[1].second;
            ///cout << tree[1].first << " " << tree[1].second << " " << query(1, 1, n, 8, 8).first << endl;
            ans = ans + tree[1].first;
            clean(mx);
        }

        cout << ans << endl;
    }
}

int main()
{
    solve();
    return 0;
}

Compilation message

Main.cpp: In function 'void trav(int, int)':
Main.cpp:18:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for (int i = 0; i < g[v].size(); i ++)
      |                     ~~^~~~~~~~~~~~~
Main.cpp: In function 'void calc(int)':
Main.cpp:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int i = 0; i < g[v].size(); i++)
      |                     ~~^~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5012 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5012 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 8 ms 5020 KB Output is correct
4 Correct 10 ms 5016 KB Output is correct
5 Correct 7 ms 5012 KB Output is correct
6 Correct 13 ms 5076 KB Output is correct
7 Correct 12 ms 5020 KB Output is correct

Subtask #3
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5012 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 8 ms 5020 KB Output is correct
4 Correct 10 ms 5016 KB Output is correct
5 Correct 7 ms 5012 KB Output is correct
6 Correct 13 ms 5076 KB Output is correct
7 Correct 12 ms 5020 KB Output is correct
8 Correct 169 ms 5248 KB Output is correct
9 Correct 277 ms 5296 KB Output is correct
10 Correct 272 ms 5264 KB Output is correct
11 Correct 123 ms 5236 KB Output is correct
12 Correct 179 ms 5328 KB Output is correct

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5012 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 8 ms 5020 KB Output is correct
4 Correct 10 ms 5016 KB Output is correct
5 Correct 7 ms 5012 KB Output is correct
6 Correct 13 ms 5076 KB Output is correct
7 Correct 12 ms 5020 KB Output is correct
8 Correct 169 ms 5248 KB Output is correct
9 Correct 277 ms 5296 KB Output is correct
10 Correct 272 ms 5264 KB Output is correct
11 Correct 123 ms 5236 KB Output is correct
12 Correct 179 ms 5328 KB Output is correct
13 Execution timed out 1091 ms 5456 KB Time limit exceeded
14 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1086 ms 24956 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 32.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5012 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 8 ms 5020 KB Output is correct
4 Correct 10 ms 5016 KB Output is correct
5 Correct 7 ms 5012 KB Output is correct
6 Correct 13 ms 5076 KB Output is correct
7 Correct 12 ms 5020 KB Output is correct
8 Correct 169 ms 5248 KB Output is correct
9 Correct 277 ms 5296 KB Output is correct
10 Correct 272 ms 5264 KB Output is correct
11 Correct 123 ms 5236 KB Output is correct
12 Correct 179 ms 5328 KB Output is correct
13 Execution timed out 1091 ms 5456 KB Time limit exceeded
14 Halted 0 ms 0 KB -