結果

問題 No.1843 Tree ANDistance
ユーザー kai4096_don
提出日時 2022-02-18 21:44:29
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 551 ms / 2,000 ms
コード長 4,021 bytes
コンパイル時間 3,667 ms
コンパイル使用メモリ 240,076 KB
実行使用メモリ 30,720 KB
最終ジャッジ日時 2024-06-29 08:35:27
合計ジャッジ時間 14,775 ms
ジャッジサーバーID
(参考情報)
judge5 / judge2
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ファイルパターン 結果
other AC * 38
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ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
const long nPrime = 1000000007;
//const long nPrime = 998244353;
typedef long long ll;
struct UnionFind {
vector<int> size, parents;
UnionFind() {}
UnionFind(int n) {
size.resize(n, 1);
parents.resize(n, 0);
for (int i = 0; i < n; i++) {
MakeTree(i);
}
}
void MakeTree(int x) {
parents[x] = x;
}
bool IsSame(int x, int y) { return FindRoot(x) == FindRoot(y); }
void Unite(int x, int y) {
x = FindRoot(x);
y = FindRoot(y);
if(x==y){
return;
}
if (size[x] > size[y]) {
parents[y] = x;
size[x] += size[y];
size[y] = -1;
} else {
parents[x] = y;
size[y] += size[x];
size[x] = -1;
}
}
int FindRoot(int x) {
if (x != parents[x]) parents[x] = FindRoot(parents[x]);
return parents[x];
}
int GetSize(int x){
return size[FindRoot(x)];
}
};
const long long nMod = nPrime;
class ModInt {
long long x;
public:
ModInt(long long x=0) : x((x%nMod+nMod)%nMod) {}
ModInt operator-() const {
return ModInt(-x);
}
ModInt& operator+=(const ModInt& a) {
if ((x += a.x) >= nMod) x -= nMod;
return *this;
}
ModInt& operator-=(const ModInt& a) {
if ((x += nMod-a.x) >= nMod) x -= nMod;
return *this;
}
ModInt& operator*=(const ModInt& a) {
(x *= a.x) %= nMod;
return *this;
}
ModInt operator+(const ModInt& a) const {
ModInt res(*this);
return res+=a;
}
ModInt operator-(const ModInt& a) const {
ModInt res(*this);
return res-=a;
}
ModInt operator*(const ModInt& a) const {
ModInt res(*this);
return res*=a;
}
ModInt Pow(long long t) const {
if (!t) return 1;
ModInt a = Pow(t>>1);
a *= a;
if (t&1) a *= *this;
return a;
}
// for prime nMod
ModInt Inv() const {
return Pow(nMod-2);
}
ModInt& operator/=(const ModInt& a) {
return (*this) *= a.Inv();
}
ModInt operator/(const ModInt& a) const {
ModInt res(*this);
return res/=a;
}
friend ostream& operator<<(ostream& os, const ModInt& m){
os << m.x;
return os;
}
};
void MakeTable(vector<ModInt> &viInv, vector<ModInt> &viFctr,
vector<ModInt> &viFctrInv, bool bUseFctr = false,
const long nTableSize = 1000000){
viInv.resize(nTableSize+1, 1);
for(long i = 1; i < nTableSize+1; i++){
viInv[i] /= i;
}
if(!bUseFctr){
return;
}
viFctr.resize(nTableSize+1, 1);
viFctrInv.resize(nTableSize+1, 1);
for(long i = 1; i < nTableSize+1; i++){
viFctr[i] = viFctr[i-1] * i;
}
viFctrInv[nTableSize] /= viFctr[nTableSize];
for(long i = nTableSize; i >= 1; i--){
viFctrInv[i-1] = viFctrInv[i]*i;
}
}
int main() {
long n;
cin >> n;
vector<pair<pair<long,long>,long>> viEdge(n-1);
for(long i = 0; i < n-1; i++){
long a,b,c;
cin >> a >> b >> c;
a--,b--;
viEdge[i] = make_pair(make_pair(a,b),c);
}
ModInt nAns = 0;
vector<UnionFind> vzGroup(31,UnionFind(n));
for(long i = 0; i <= 30; i++){
for(long j = 0; j < n-1; j++){
long a = viEdge[j].first.first;
long b = viEdge[j].first.second;
long c = viEdge[j].second;
if((c&(1<<i))!=0){
vzGroup[i].Unite(a,b);
}
}
ModInt iThis = 0;
for(long j = 0; j < n; j++){
if(vzGroup[i].FindRoot(j)==j){
ModInt m = vzGroup[i].GetSize(j);
iThis += m*(m-1)/2;
}
}
nAns += iThis*(1<<i);
}
cout << nAns << endl;
return 0;
}
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