結果

問題 No.1364 [Renaming] Road to Cherry from Zelkova
ユーザー fastmathfastmath
提出日時 2021-01-22 23:39:53
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
(最新)
AC  
(最初)
実行時間 -
コード長 4,905 bytes
コンパイル時間 2,127 ms
コンパイル使用メモリ 202,940 KB
最終ジャッジ日時 2025-01-18 06:27:36
ジャッジサーバーID
(参考情報)
judge2 / judge5
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 44 WA * 1
権限があれば一括ダウンロードができます

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>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define x first
#define y second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';
#define FOR(i, n) for (int i = 0; i < n; ++i)
#define pb push_back
#define trav(a, x) for (auto& a : x)
using vi = vector<int>;
template <typename T>
std::ostream& operator <<(std::ostream& output, const pair <T, T> & data)
{
output << "(" << data.x << "," << data.y << ")";
return output;
}
template <typename T>
std::ostream& operator <<(std::ostream& output, const std::vector<T>& data)
{
for (const T& x : data)
output << x << " ";
return output;
}
ll div_up(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll div_down(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
#define tcT template<class T
#define tcTU tcT, class U
tcT> using V = vector<T>;
tcT> void re(V<T>& x) {
trav(a, x)
cin >> a;
}
tcT> bool ckmin(T& a, const T& b) {
return b < a ? a = b, 1 : 0;
} // set a = min(a,b)
tcT> bool ckmax(T& a, const T& b) {
return a < b ? a = b, 1 : 0;
}
//need define int long long
namespace Stuff {
const int MOD = 1e9+7;
int mod(int n) {
n %= MOD;
if (n < 0) return n + MOD;
else return n;
}
int fp(int a, int p) {
int ans = 1, c = a;
for (int i = 0; (1ll << i) <= p; ++i) {
if ((p >> i) & 1) ans = mod(ans * c);
c = mod(c * c);
}
return ans;
}
int dv(int a, int b) { return mod(a * fp(b, MOD - 2)); }
};
struct M {
ll x;
M (int x_) { x = Stuff::mod(x_); }
M () { x = 0; }
M operator + (M y) {
int ans = x + y.x;
if (ans >= Stuff::MOD)
ans -= Stuff::MOD;
return M(ans);
}
M operator - (M y) {
int ans = x - y.x;
if (ans < 0)
ans += Stuff::MOD;
return M(ans);
}
M operator * (M y) { return M(x * y.x % Stuff::MOD); }
M operator / (M y) { return M(x * Stuff::fp(y.x, Stuff::MOD - 2) % Stuff::MOD); }
M operator + (int y) { return (*this) + M(y); }
M operator - (int y) { return (*this) - M(y); }
M operator * (int y) { return (*this) * M(y); }
M operator / (int y) { return (*this) / M(y); }
M operator ^ (int p) { return M(Stuff::fp(x, p)); }
void operator += (M y) { *this = *this + y; }
void operator -= (M y) { *this = *this - y; }
void operator *= (M y) { *this = *this * y; }
void operator /= (M y) { *this = *this / y; }
void operator += (int y) { *this = *this + y; }
void operator -= (int y) { *this = *this - y; }
void operator *= (int y) { *this = *this * y; }
void operator /= (int y) { *this = *this / y; }
void operator ^= (int p) { *this = *this ^ p; }
bool operator == (M y) { return x == y.x; }
};
std::ostream& operator << (std::ostream& o, const M& a)
{
cout << a.x;
return o;
}
const int N = 1e5+7;
V <vi> g[N];
vi gr[N], rg[N];
bool del[N];
bool used[N];
void dfs(int u, vi g[N]) {
used[u] = 1;
for (int v : g[u])
if (!used[v])
dfs(v, g);
}
vi top;
int pos[N];
void jfs(int u) {
used[u] = 1;
for (auto v : gr[u]) {
if (!used[v]) {
jfs(v);
}
}
top.app(u);
}
int n;
M cnt[N], sum[N];
void calc(int u) {
used[u] = 1;
if (u == n) {
sum[u] = 0;
cnt[u] = 1;
/*
debug(u);
debug(cnt[u]);
debug(sum[u]);
*/
return;
}
for (auto e : g[u]) {
int v = e[0];
int l = e[1];
int a = e[2];
if (!used[v]) {
calc(v);
}
cnt[u] += cnt[v] * a;
sum[u] += sum[v] * a + cnt[v] * a * l;
}
/*
debug(u);
debug(cnt[u]);
debug(sum[u]);
*/
}
signed main() {
#ifdef HOME
freopen("input.txt", "r", stdin);
#else
#define endl '\n'
ios_base::sync_with_stdio(0); cin.tie(0);
#endif
int m;
cin >> n >> m;
FOR (i, m) {
int u, v, l, a;
cin >> u >> v >> l >> a;
g[u].app({v, l, a});
gr[u].app(v);
rg[v].app(u);
}
dfs(0, gr);
FOR (i, n + 1) {
if (!used[i])
del[i] = 1;
}
memset(used, 0, sizeof used);
dfs(n, rg);
FOR (i, n + 1) {
if (!used[i])
del[i] = 1;
}
if (del[0] || del[n]) {
cout << 0 << endl;
exit(0);
}
memset(used, 0, sizeof used);
jfs(0);
reverse(all(top));
FOR (i, (int)top.size())
pos[top[i]] = i;
FOR (u, n + 1)
trav(v, gr[u])
if (pos[u] > pos[v]) {
cout << "INF" << endl;
exit(0);
}
memset(used, 0, sizeof used);
calc(0);
cout << sum[0] << endl;
}
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