結果
| 問題 |
No.1418 Sum of Sum of Subtree Size
|
| コンテスト | |
| ユーザー |
fastmath
|
| 提出日時 | 2021-03-05 21:47:21 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 70 ms / 2,000 ms |
| コード長 | 2,952 bytes |
| コンパイル時間 | 1,168 ms |
| コンパイル使用メモリ | 127,596 KB |
| 最終ジャッジ日時 | 2025-01-19 10:51:56 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 41 |
ソースコード
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <ctime>
#include <cassert>
#include <complex>
#include <string>
#include <cstring>
#include <chrono>
#include <random>
#include <bitset>
#include <fstream>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define x first
#define y second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cerr << #x << ": " << x << '\n';
#define FOR(i, n) for (int i = 0; i < n; ++i)
#define pb push_back
#define trav(a, x) for (auto& a : x)
using vi = vector<int>;
template <typename T>
std::ostream& operator <<(std::ostream& output, const pair <T, T> & data)
{
output << "(" << data.x << "," << data.y << ")";
return output;
}
template <typename T>
std::ostream& operator <<(std::ostream& output, const std::vector<T>& data)
{
for (const T& x : data)
output << x << " ";
return output;
}
ll div_up(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll div_down(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
ll math_mod(ll a, ll b) { return a - b * div_down(a, b); }
#define tcT template<class T
#define tcTU tcT, class U
tcT> using V = vector<T>;
tcT> void re(V<T>& x) {
trav(a, x)
cin >> a;
}
tcT> bool ckmin(T& a, const T& b) {
return b < a ? a = b, 1 : 0;
} // set a = min(a,b)
tcT> bool ckmax(T& a, const T& b) {
return a < b ? a = b, 1 : 0;
}
ll gcd(ll a, ll b) {
while (b) {
tie(a, b) = mp(b, a % b);
}
return a;
}
const int N = 1e5+7;
int n;
vi g[N];
const int LG = 20;
int ptr = 0, to[N][LG], h[N], l[N], r[N];
int cnt[N];
int ans = 0;
void calc(int u, int p) {
to[u][0] = p;
for (int i = 1; i < LG; ++i)
to[u][i] = to[to[u][i-1]][i-1];
l[u] = ptr;
ptr++;
cnt[u] = 1;
for (int v : g[u])
if (v != p) {
h[v] = h[u]+1;
calc(v, u);
cnt[u] += cnt[v];
ans += cnt[v] * (n - cnt[v]);
}
ans += (n - cnt[u]) * cnt[u];
ans += n;
r[u] = ptr - 1;
}
bool anc(int u, int v) { return l[u] <= l[v] && r[v] <= r[u]; }
int lca(int u, int v) {
if (anc(u,v))
return u;
for (int i = LG - 1; i >= 0; --i)
if (!anc(to[u][i], v))
u = to[u][i];
return to[u][0];
}
int dist(int u, int v) { return h[u] + h[v] - 2 * h[lca(u,v)]; }
signed main() {
#ifdef ONLINE_JUDGE
#define endl '\n'
ios_base::sync_with_stdio(0); cin.tie(0);
#endif
cin >> n;
FOR (i, n - 1) {
int u, v;
cin >> u >> v;
g[u].app(v);
g[v].app(u);
}
calc(1, 1);
cout << ans << endl;
}
fastmath