結果
| 問題 |
No.1364 [Renaming] Road to Cherry from Zelkova
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-01-22 21:46:02 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 159 ms / 2,500 ms |
| コード長 | 6,602 bytes |
| コンパイル時間 | 2,475 ms |
| コンパイル使用メモリ | 211,492 KB |
| 最終ジャッジ日時 | 2025-01-18 04:07:03 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 45 |
ソースコード
//@formatter:off
#include<bits/stdc++.h>
#define overload4(_1,_2,_3,_4,name,...) name
#define rep1(i,n) for (ll i = 0; i < ll(n); ++i)
#define rep2(i,s,n) for (ll i = ll(s); i < ll(n); ++i)
#define rep3(i,s,n,d) for(ll i = ll(s); i < ll(n); i+=d)
#define rep(...) overload4(__VA_ARGS__,rep3,rep2,rep1)(__VA_ARGS__)
#define rrep(i,n) for (ll i = ll(n)-1; i >= 0; i--)
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define pb push_back
#define eb emplace_back
#ifdef __LOCAL
#define debug(...) { cout << #__VA_ARGS__; cout << ": "; print(__VA_ARGS__); cout << flush; }
#else
#define debug(...) void(0)
#endif
#define INT(...) int __VA_ARGS__;scan(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__;scan(__VA_ARGS__)
#define STR(...) string __VA_ARGS__;scan(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__;scan(__VA_ARGS__)
#define DBL(...) double __VA_ARGS__;scan(__VA_ARGS__)
#define LD(...) ld __VA_ARGS__;scan(__VA_ARGS__)
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<int,int>;
using LP = pair<ll,ll>;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vd = vector<double>;
using vvd = vector<vector<double>>;
using vs = vector<string>;
using vc = vector<char>;
using vvc = vector<vector<char>>;
using vb = vector<bool>;
using vvb = vector<vector<bool>>;
using vp = vector<P>;
using vvp = vector<vector<P>>;
template<class S,class T> istream& operator>>(istream &is,pair<S,T> &p) { return is >> p.first >> p.second; }
template<class S,class T> ostream& operator<<(ostream &os,const pair<S,T> &p) { return os<<'{'<<p.first<<","<<p.second<<'}'; }
template<class T> istream& operator>>(istream &is,vector<T> &v) { for(T &t:v){is>>t;} return is; }
template<class T> ostream& operator<<(ostream &os,const vector<T> &v) { os<<'[';rep(i,v.size())os<<v[i]<<(i==int(v.size()-1)?"":","); return os<<']'; }
template<class T> bool chmin(T& a,T b) {if(a > b){a = b; return true;} return false;}
template<class T> bool chmax(T& a,T b) {if(a < b){a = b; return true;} return false;}
void scan(){}
template <class Head, class... Tail> void scan(Head& head, Tail&... tail){ cin >> head; scan(tail...); }
template<class T> void print(const T& t){ cout << t << '\n'; }
template <class Head, class... Tail> void print(const Head& head, const Tail&... tail){ cout<<head<<' '; print(tail...); }
template<class T> void fin(T a) { print(a); exit(0); }
const string yes[] = {"no","yes"};
const string Yes[] = {"No","Yes"};
const string YES[] = {"NO","YES"};
const int inf = 1001001001;
const ll linf = 1001001001001001001;
//@formatter:on
constexpr int mod = 1000000007;
//constexpr int mod = 998244353;
struct mint {
ll x;
constexpr mint(ll x = 0) : x((x % mod + mod) % mod) {}
constexpr mint operator-() const { return mint(-x); }
constexpr mint &operator+=(const mint &a) {
if ((x += a.x) >= mod) x -= mod;
return *this;
}
constexpr mint &operator++() { return *this += mint(1); }
constexpr mint &operator-=(const mint &a) {
if ((x += mod - a.x) >= mod) x -= mod;
return *this;
}
constexpr mint &operator--() { return *this -= mint(1); }
constexpr mint &operator*=(const mint &a) {
(x *= a.x) %= mod;
return *this;
}
constexpr mint operator+(const mint &a) const {
mint res(*this);
return res += a;
}
constexpr mint operator-(const mint &a) const {
mint res(*this);
return res -= a;
}
constexpr mint operator*(const mint &a) const {
mint res(*this);
return res *= a;
}
constexpr mint pow(ll t) const {
mint res = mint(1), a(*this);
while (t > 0) {
if (t & 1) res *= a;
t >>= 1;
a *= a;
}
return res;
}
// for prime mod
constexpr mint inv() const { return pow(mod - 2); }
constexpr mint &operator/=(const mint &a) { return *this *= a.inv(); }
constexpr mint operator/(const mint &a) const {
mint res(*this);
return res /= a;
}
};
ostream &operator<<(ostream &os, const mint &a) { return os << a.x; }
bool operator==(const mint &a, const mint &b) { return a.x == b.x; }
bool operator!=(const mint &a, const mint &b) { return a.x != b.x; }
bool operator==(const mint &a, const int &b) { return a.x == b; }
bool operator!=(const mint &a, const int &b) { return a.x != b; }
struct edge {
int to, l, a;
edge(int to, int l, int a) : to(to), l(l), a(a) {}
};
mint dp[100010];
mint cnt[100010];
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
INT(n, m);
n++;
vector<vector<edge>> G(n);
vector<vector<edge>> rG(n);
rep(_, m) {
INT(u, v, l, a);
G[u].eb(v, l, a);
rG[v].eb(u, l, a);
}
vb ok(n, false);
ok[n - 1] = true;
queue<int> q;
q.push(n - 1);
while (!q.empty()) {
int u = q.front();
q.pop();
for (auto &e : rG[u]) {
if (ok[e.to]) continue;
ok[e.to] = true;
q.push(e.to);
}
}
if (!ok[0]) fin(0);
vb nok(n, false);
nok[0] = true;
q.push(0);
while (!q.empty()) {
int u = q.front();
q.pop();
for (auto &e : G[u]) {
if (nok[e.to]) continue;
nok[e.to] = true;
q.push(e.to);
}
}
assert(nok[n - 1]);
rep(i, n) ok[i] = ok[i] & nok[i];
vi in(n);
int sz = 0;
rep(i, n) {
if (!ok[i]) continue;
sz++;
for (auto &e : G[i]) {
if (!ok[e.to]) continue;
in[e.to]++;
}
}
vi ord;
rep(i, n) if (ok[i] and !in[i]) q.push(i);
while (!q.empty()) {
int u = q.front();
assert(ok[u]);
q.pop();
ord.pb(u);
for (auto &e : G[u]) {
if (!ok[e.to]) continue;
if (--in[e.to] == 0) q.push(e.to);
}
}
if (ord.size() < sz) fin("INF");
assert(ord.size() == sz);
assert(ord[0] == 0);
assert(ord.back() == n - 1);
vi pos(n, -1);
rep(i, sz) pos[ord[i]] = i;
cnt[0] = 1;
rep(i, sz) {
if (cnt[i] == 0) continue;
int now = ord[i];
for (auto &e : G[now]) {
if (!ok[e.to]) continue;
int nx = pos[e.to];
assert(nx > i);
cnt[nx] += cnt[i] * e.a;
dp[nx] += dp[i] * e.a + cnt[i] * e.a * e.l;
}
}
print(dp[sz - 1]);
}