結果
| 問題 |
No.1843 Tree ANDistance
|
| コンテスト | |
| ユーザー |
milanis48663220
|
| 提出日時 | 2022-02-18 21:31:40 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 102 ms / 2,000 ms |
| コード長 | 4,398 bytes |
| コンパイル時間 | 1,270 ms |
| コンパイル使用メモリ | 118,328 KB |
| 最終ジャッジ日時 | 2025-01-27 23:42:07 |
|
ジャッジサーバーID (参考情報) |
judge1 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 38 |
ソースコード
#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>
#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
using namespace std;
typedef long long ll;
template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
return vector<vector<T>>(n, vector<T>(m, v));
}
template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}
template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
if(v.empty()) {
cout << endl;
return;
}
for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
cout << v.back() << endl;
}
const ll MOD = 1000000007;
class ModInt{
public:
ll v;
ModInt(ll _v = 0){
if(_v < 0) _v = (_v%MOD)+MOD;
if(_v >= MOD) _v %= MOD;
v = _v;
}
ModInt operator+(ll n){
return ModInt((v+n)%MOD);
}
ModInt operator-(ll n){
return ModInt((v-n+MOD)%MOD);
}
ModInt operator*(ll n){
if(n >= MOD) n %= MOD;
return ModInt((v*n)%MOD);
}
ModInt operator/(ll n){
return ModInt((ModInt(n).inv()*v).v%MOD);
}
ModInt &operator+=(ll n){
v = (v+n)%MOD;
return *this;
}
ModInt &operator-=(ll n){
v = (v-n+MOD)%MOD;
return *this;
}
ModInt &operator*=(ll n){
v = (v*n+MOD)%MOD;
return *this;
}
ModInt operator+(ModInt n){
return ModInt((v+n.v)%MOD);
}
ModInt operator-(ModInt n){
return ModInt((v-n.v+MOD)%MOD);
}
ModInt operator*(ModInt n){
return ModInt((v*n.v)%MOD);
}
ModInt operator/(ModInt n){
return ModInt((n.inv()*v).v%MOD);
}
ModInt &operator+=(ModInt n){
v = (v+n.v)%MOD;
return *this;
}
ModInt &operator-=(ModInt n){
v = (v-n.v+MOD)%MOD;
return *this;
}
ModInt &operator*=(ModInt n){
v = (v*n.v)%MOD;
return *this;
}
bool operator==(ModInt n){
return v == n.v;
}
bool operator!=(ModInt n){
return v != n.v;
}
ModInt &operator=(ll n){
v = n%MOD;
return *this;
}
ModInt inv(){
if(v == 1) return ModInt(1);
else return ModInt(MOD-ModInt(MOD%v).inv().v*(MOD/v)%MOD);
}
};
ostream& operator<<(ostream& os, const ModInt& m){
os << m.v;
return os;
}
istream & operator >> (istream &in, ModInt &m){
in >> m.v;
return in;
}
ModInt pow(ModInt a, ll n) {
assert(n >= 0);
ModInt ans = 1;
while (n > 0) {
if (n&1) ans = ans*a;
a = a*a;
n >>= 1;
}
return ans;
}
struct UnionFind {
vector<int> data;
UnionFind(int size) : data(size, -1) {}
bool unionSet(int x, int y) {
x = root(x); y = root(y);
if (x != y) {
if (data[y] < data[x]) swap(x, y);
data[x] += data[y]; data[y] = x;
}
return x != y;
}
bool findSet(int x, int y) {
return root(x) == root(y);
}
int root(int x) {
return data[x] < 0 ? x : data[x] = root(data[x]);
}
int size(int x) {
return -data[root(x)];
}
};
using mint = ModInt;
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout << setprecision(10) << fixed;
int n; cin >> n;
vector<int> a(n-1), b(n-1), c(n-1);
for(int i = 0; i < n-1; i++){
cin >> a[i] >> b[i] >> c[i]; a[i]--; b[i]--;
}
mint ans = 0;
for(int i = 0; i < 30; i++){
UnionFind uf(n);
for(int j = 0; j < n-1; j++){
if(c[j]&(1<<i)) {
uf.unionSet(a[j], b[j]);
}
}
for(int j = 0; j < n; j++){
if(uf.root(j) == j){
mint x = uf.size(j);
ans += (x*(x-1))*(1<<i)/2;
}
}
}
cout << ans << endl;
}
milanis48663220