結果
問題 | No.1333 Squared Sum |
ユーザー | heno239 |
提出日時 | 2021-01-08 21:52:23 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 479 ms / 2,000 ms |
コード長 | 5,028 bytes |
コンパイル時間 | 2,018 ms |
コンパイル使用メモリ | 150,968 KB |
実行使用メモリ | 146,048 KB |
最終ジャッジ日時 | 2024-11-16 11:18:04 |
合計ジャッジ時間 | 13,414 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 23 ms
29,824 KB |
testcase_01 | AC | 24 ms
29,952 KB |
testcase_02 | AC | 23 ms
29,952 KB |
testcase_03 | AC | 331 ms
54,656 KB |
testcase_04 | AC | 331 ms
54,656 KB |
testcase_05 | AC | 332 ms
54,656 KB |
testcase_06 | AC | 331 ms
54,656 KB |
testcase_07 | AC | 328 ms
54,528 KB |
testcase_08 | AC | 322 ms
54,528 KB |
testcase_09 | AC | 340 ms
54,656 KB |
testcase_10 | AC | 326 ms
54,784 KB |
testcase_11 | AC | 331 ms
54,784 KB |
testcase_12 | AC | 336 ms
54,528 KB |
testcase_13 | AC | 313 ms
146,048 KB |
testcase_14 | AC | 455 ms
103,040 KB |
testcase_15 | AC | 479 ms
135,552 KB |
testcase_16 | AC | 23 ms
30,080 KB |
testcase_17 | AC | 25 ms
29,952 KB |
testcase_18 | AC | 23 ms
30,080 KB |
testcase_19 | AC | 23 ms
29,952 KB |
testcase_20 | AC | 23 ms
29,952 KB |
testcase_21 | AC | 23 ms
29,952 KB |
testcase_22 | AC | 23 ms
29,824 KB |
testcase_23 | AC | 23 ms
30,080 KB |
testcase_24 | AC | 21 ms
29,952 KB |
testcase_25 | AC | 22 ms
29,952 KB |
testcase_26 | AC | 461 ms
143,744 KB |
testcase_27 | AC | 453 ms
105,216 KB |
testcase_28 | AC | 455 ms
142,976 KB |
testcase_29 | AC | 312 ms
146,048 KB |
testcase_30 | AC | 125 ms
40,192 KB |
testcase_31 | AC | 73 ms
35,968 KB |
testcase_32 | AC | 183 ms
44,928 KB |
testcase_33 | AC | 143 ms
41,856 KB |
testcase_34 | AC | 262 ms
49,920 KB |
testcase_35 | AC | 183 ms
45,184 KB |
testcase_36 | AC | 106 ms
38,912 KB |
testcase_37 | AC | 106 ms
39,296 KB |
testcase_38 | AC | 122 ms
40,960 KB |
testcase_39 | AC | 214 ms
46,976 KB |
testcase_40 | AC | 209 ms
62,624 KB |
testcase_41 | AC | 196 ms
62,620 KB |
testcase_42 | AC | 191 ms
62,748 KB |
testcase_43 | AC | 186 ms
62,628 KB |
ソースコード
#pragma GCC optimize("Ofast") //#pragma GCC target ("sse4") #include<iostream> #include<string> #include<cstdio> #include<vector> #include<cmath> #include<algorithm> #include<functional> #include<iomanip> #include<queue> #include<ciso646> #include<random> #include<map> #include<set> #include<bitset> #include<stack> #include<unordered_map> #include<unordered_set> #include<utility> #include<cassert> #include<complex> #include<numeric> #include<array> using namespace std; //#define int long long typedef long long ll; typedef unsigned long long ul; typedef unsigned int ui; constexpr ll mod = 1000000007; const ll INF = mod * mod; typedef pair<int, int>P; #define stop char nyaa;cin>>nyaa; #define rep(i,n) for(int i=0;i<n;i++) #define per(i,n) for(int i=n-1;i>=0;i--) #define Rep(i,sta,n) for(int i=sta;i<n;i++) #define rep1(i,n) for(int i=1;i<=n;i++) #define per1(i,n) for(int i=n;i>=1;i--) #define Rep1(i,sta,n) for(int i=sta;i<=n;i++) #define all(v) (v).begin(),(v).end() typedef pair<ll, ll> LP; typedef double ld; typedef pair<ld, ld> LDP; const ld eps = 1e-12; const ld pi = acosl(-1.0); ll mod_pow(ll x, ll n, ll m = mod) { if (n < 0) { ll res = mod_pow(x, -n, m); return mod_pow(res, m - 2, m); } if (abs(x) >= m)x %= m; if (x < 0)x += m; ll res = 1; while (n) { if (n & 1)res = res * x % m; x = x * x % m; n >>= 1; } return res; } struct modint { ll n; modint() :n(0) { ; } modint(ll m) :n(m) { if (n >= mod)n %= mod; else if (n < 0)n = (n % mod + mod) % mod; } operator int() { return n; } }; bool operator==(modint a, modint b) { return a.n == b.n; } modint operator+=(modint& a, modint b) { a.n += b.n; if (a.n >= mod)a.n -= mod; return a; } modint operator-=(modint& a, modint b) { a.n -= b.n; if (a.n < 0)a.n += mod; return a; } modint operator*=(modint& a, modint b) { a.n = ((ll)a.n * b.n) % mod; return a; } modint operator+(modint a, modint b) { return a += b; } modint operator-(modint a, modint b) { return a -= b; } modint operator*(modint a, modint b) { return a *= b; } modint operator^(modint a, ll n) { if (n == 0)return modint(1); modint res = (a * a) ^ (n / 2); if (n % 2)res = res * a; return res; } ll inv(ll a, ll p) { return (a == 1 ? 1 : (1 - p * inv(p % a, a)) / a + p); } modint operator/(modint a, modint b) { return a * modint(inv(b, mod)); } modint operator/=(modint& a, modint b) { a = a / b; return a; } const int max_n = 1 << 17; modint fact[max_n], factinv[max_n]; void init_f() { fact[0] = modint(1); for (int i = 0; i < max_n - 1; i++) { fact[i + 1] = fact[i] * modint(i + 1); } factinv[max_n - 1] = modint(1) / fact[max_n - 1]; for (int i = max_n - 2; i >= 0; i--) { factinv[i] = factinv[i + 1] * modint(i + 1); } } modint comb(int a, int b) { if (a < 0 || b < 0 || a < b)return 0; return fact[a] * factinv[b] * factinv[a - b]; } modint combP(int a, int b) { if (a < 0 || b < 0 || a < b)return 0; return fact[a] * factinv[a - b]; } using mP = pair<modint, modint>; const int mn = 1 << 18; struct edge { int to; ll cost; }; using Data = array<modint,3>; vector<edge> G[mn]; vector<int> ids[mn]; vector<Data> memo[mn]; vector<ll> costs[mn]; int root; Data merge(Data a, Data b) { Data res; // res[0] = a[0] + b[0]; res[1] = a[1] + b[1]; res[2] = a[2] + b[2]; // return res; } Data dfs(int id, int fr) { Data res; // //initialize res = {1, 0,0 }; // for (edge e : G[id]) { if (e.to == fr)continue; Data nex = dfs(e.to, id); // //update with edge nex[2]+= nex[0]*(modint)(e.cost*e.cost) + (modint)(2*e.cost)* nex[1]; nex[1] += (modint)e.cost * nex[0]; // res = merge(res, nex); ids[id].push_back(e.to); memo[id].push_back(nex); costs[id].push_back(e.cost); } // //update for return // return res; } modint ans = 0; void invdfs(int id, int fr, Data pre) { vector<Data> v; for (Data d : memo[id])v.push_back(d); if (fr >= 0)v.push_back(pre); int len = v.size(); // //calcurate id's ans Data ex = { 0,0,0 }; for (Data d : v)ex = merge(ex, d); ans += ex[2]; //cout << id << " " << ex[0]<<" "<<ex[1]<<" "<<ex[2] << "\n"; // vector<Data> le(len + 1); vector<Data> ri(len + 1); // Data init_c = { 0,0,0 }; // le[0] = init_c; rep(i, len) { le[i + 1] = merge(le[i], v[i]); } ri[len] = init_c; per(i, len) { ri[i] = merge(ri[i + 1], v[i]); } rep(i, ids[id].size()) { int to = ids[id][i]; Data d = merge(le[i], ri[i + 1]); // //update for return d[0] += 1; d[2] += (modint)(costs[id][i]*costs[id][i])*d[0]+(modint)(2*costs[id][i]) * d[1]; d[1] += (modint)costs[id][i]*d[0]; // invdfs(to, id, d); } } void yaru() { dfs(root, -1); invdfs(root, -1, { 0,0 }); } void solve() { int n; cin >> n; rep(i, n - 1) { int a, b, c; cin >> a >> b >> c; a--; b--; G[a].push_back({ b,c }); G[b].push_back({ a,c }); } yaru(); ans = ans / (modint)2; cout << ans << "\n"; } signed main() { ios::sync_with_stdio(false); cin.tie(0); //cout << fixed << setprecision(15); //init_f(); //init(); //expr(); //int t; cin >> t; rep(i, t) solve(); return 0; }