結果

問題 No.1333 Squared Sum
ユーザー mtsdmtsd
提出日時 2021-01-08 23:45:01
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 6,303 bytes
コンパイル時間 1,222 ms
コンパイル使用メモリ 125,920 KB
実行使用メモリ 41,472 KB
最終ジャッジ日時 2024-11-16 18:44:09
合計ジャッジ時間 10,440 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 * 9 WA * 35
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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 <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <climits>
#include <cmath>
#include <complex>
#include <cstring>
#include <deque>
#include <functional>
#include <iostream>
#include <iomanip>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <cstdint>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
#define MP make_pair
#define PB push_back
#define inf 1000000007
#define rep(i,n) for(int i = 0; i < (int)(n); ++i)
#define all(x) (x).begin(),(x).end()
template<typename A, size_t N, typename T>
void Fill(A (&array)[N], const T &val){
std::fill( (T*)array, (T*)(array+N), val );
}
template<class T> inline bool chmax(T &a, T b){
if(a<b){
a = b;
return true;
}
return false;
}
template<class T> inline bool chmin(T &a, T b){
if(a>b){
a = b;
return true;
}
return false;
}
template <unsigned int mod>
class ModInt {
private:
unsigned int v;
static unsigned int norm(const unsigned int& x){ return x < mod ? x : x - mod; }
static ModInt make(const unsigned int& x){ ModInt m; return m.v = x, m; }
static ModInt inv(const ModInt& x){ return make(inverse(x.v, mod)); }
static unsigned int inverse(int a, int m){
int u[] = {a, 1, 0}, v[] = {m, 0, 1}, t;
while(*v){
t = *u / *v;
swap(u[0] -= t * v[0], v[0]), swap(u[1] -= t * v[1], v[1]), swap(u[2] -= t * v[2], v[2]);
}
return (u[1] % m + m) % m;
}
public:
ModInt() : v{0}{}
ModInt(const long long val) : v{norm(val % mod + mod)} {}
ModInt(const ModInt<mod>& n) : v{n()} {}
explicit operator bool() const noexcept { return v != 0; }
bool operator!() const noexcept { return !static_cast<bool>(*this); }
ModInt& operator=(const ModInt& n){ return v = n(), (*this); }
ModInt& operator=(const long long val){ return v = norm(val % mod + mod), (*this); }
ModInt operator+() const { return *this; }
ModInt operator-() const { return v == 0 ? make(0) : make(mod - v); }
ModInt operator+(const ModInt& val) const { return make(norm(v + val())); }
ModInt operator-(const ModInt& val) const { return make(norm(v + mod - val())); }
ModInt operator*(const ModInt& val) const { return make((long long)v * val() % mod); }
ModInt operator/(const ModInt& val) const { return *this * inv(val); }
ModInt& operator+=(const ModInt& val){ return *this = *this + val; }
ModInt& operator-=(const ModInt& val){ return *this = *this - val; }
ModInt& operator*=(const ModInt& val){ return *this = *this * val; }
ModInt& operator/=(const ModInt& val){ return *this = *this / val; }
ModInt operator+(const long long val) const { return ModInt{v + val}; }
ModInt operator-(const long long val) const { return ModInt{v - val}; }
ModInt operator*(const long long val) const { return ModInt{(long long)v * (val % mod)}; }
ModInt operator/(const long long val) const { return ModInt{(long long)v * inv(val)}; }
ModInt& operator+=(const long long val){ return *this = *this + val; }
ModInt& operator-=(const long long val){ return *this = *this - val; }
ModInt& operator*=(const long long val){ return *this = *this * val; }
ModInt& operator/=(const long long val){ return *this = *this / val; }
bool operator==(const ModInt& val) const { return v == val.v; }
bool operator!=(const ModInt& val) const { return !(*this == val); }
bool operator==(const long long val) const { return v == norm(val % mod + mod); }
bool operator!=(const long long val) const { return !(*this == val); }
unsigned int operator()() const { return v; }
friend ModInt operator+(const long long val, const ModInt& n) { return n + val; }
friend ModInt operator-(const long long val, const ModInt& n) { return ModInt{val - n()}; }
friend ModInt operator*(const long long val, const ModInt& n) { return n * val; }
friend ModInt operator/(const long long val, const ModInt& n) { return ModInt{val} / n; }
friend bool operator==(const long long val, const ModInt& n) { return n == val; }
friend bool operator!=(const long long val, const ModInt& n) { return !(val == n); }
friend istream& operator>>(istream& is, ModInt& n){
unsigned int v;
return is >> v, n = v, is;
}
friend ostream& operator<<(ostream& os, const ModInt& n){ return (os << n()); }
friend ModInt mod_pow(ModInt x, long long n){
ModInt ans = 1;
while(n){
if(n & 1) ans *= x;
x *= x, n >>= 1;
}
return ans;
}
};
#define MOD 1000000007
using mod = ModInt<MOD>;
#define MAX_N 200000
mod inv[MAX_N],fac[MAX_N],finv[MAX_N];
void make()
{
fac[0] = fac[1] = 1;
finv[0] = finv[1] = 1;
inv[1] = 1;
for(int i=2;i<MAX_N;i++){
inv[i] = MOD - inv[MOD % i] * (MOD / i);
fac[i] = fac[i-1] * i;
finv[i] = finv[i-1] * inv[i];
}
}
mod comb(int a, int b)
{
if(a<b) return 0;
return fac[a] * finv[b] * finv[a-b];
}
vector<vector<pair<int,mod> > > g;
vector<mod> d2,d,cnt,res;
void dfs(int id,int pre){
for(auto x:g[id]){
if(x.first!=pre){
dfs(x.first,id);
}
}
for(auto x:g[id]){
if(x.first==pre)continue;
mod P = x.second;
int nxt = x.first;
res[id] += d[id] * (d[nxt]+P*cnt[nxt]) * 2;
res[id] += d2[id]*cnt[nxt] + cnt[id]*d2[nxt];
d2[id] += P*2*d[nxt];
d2[id] += cnt[nxt]*P*P;
d2[id] += d2[nxt];
d[id] += d[nxt] + cnt[nxt]*P;
cnt[id] += cnt[nxt];
}
res[id] += d2[id];
cnt[id]+=1;
}
int main(){
int n;
cin >> n;
g.resize(n);
d.resize(n);
d2.resize(n);
cnt.resize(n);
res.resize(n);
rep(i,n-1){
int a,b,c;
cin >> a >> b >> c;
a--;b--;
g[a].push_back(MP(b,c));
g[b].push_back(MP(a,c));
}
dfs(0,-1);
mod ans = 0;
rep(i,n){
ans += res[i];
// cerr << i << ": " << d[i] << " " << d2[i] << " " << cnt[i] << " " << res[i] << endl;
}
cout << ans << endl;
return 0;
}
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