Submission #217574

#	Time	Username	Problem	Language	Result	Execution time	Memory
217574		dimash241	Shell (info1cup18_shell)	C++17	100 / 100	382 ms	47992 KiB

shell

//#pragma GCC target("avx2")
//#pragma GCC optimize("O3")

//# include <x86intrin.h>
# include <bits/stdc++.h>

//# include <ext/pb_ds/assoc_container.hpp>
//# include <ext/pb_ds/tree_policy.hpp>

//using namespace __gnu_pbds;
using namespace std;
 
//template<typename T> using ordered_set = tree <T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define _USE_MATH_DEFINES_
#define ll long long
#define ld long double
#define Accepted 0
#define pb push_back
#define mp make_pair
#define sz(x) (int)(x.size())
#define every(x) x.begin(),x.end()
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define For(i,x,y)  for (ll i = x; i <= y; i ++) 
#define FOr(i,x,y)  for (ll i = x; i >= y; i --)
#define SpeedForce ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0)
// ROAD to...                                                                                                                                                                                                                Red

inline void Input_Output () {
	//freopen(".in", "r", stdin);
   //freopen(".out", "w", stdout);
}

const double eps = 0.000001;
const ld pi = acos(-1);
const int maxn = 1e7 + 9;
const int mod = 1e9 + 7;
const ll MOD = 1e18 + 9;
const ll INF = 1e18 + 123;
const int inf = 2e9 + 11;
const int mxn = 1e6 + 9;
const int N = 1e6 + 123;                                          
const int M = 22;
const int pri = 997;
const int Magic = 2101;

const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, -1, 0, 1};
 
int n, m, k;
int a[N];
vector < int > g[N];
int dp[N];
int ptr[N];

void dfs (int v) {
	dp[v] = 0;
	if (v == n) {
		ptr[v] = 1;
		dp[v] = 1;
		if (v == a[k-ptr[v]+1]) ptr[v]++;
		return;
	}
	for (auto to : g[v]) {
		if(!ptr[to]) dfs(to);

		if (ptr[to] > ptr[v]) {
			dp[v] = dp[to];
			ptr[v] = ptr[to];
		} else if(ptr[to] == ptr[v]) {
			(dp[v] += dp[to]) %= mod;
		}
	}

	if (v == a[k-ptr[v]+1]) ptr[v]++;
}

int main () {
	scanf("%d%d%d", &n, &m, &k);
	for (int i = 1; i <= k; ++i) {
		scanf("%d", a + i);
	}
	for (int i = 0; i < m; ++i) {
		int l, r;
		scanf("%d%d", &l, &r);
		g[l].pb(r);
	}

	dfs(1);
	cout << dp[1] << '\n';
	return Accepted;
}

// B...a

Compilation message (stderr)

shell.cpp: In function 'int main()':
shell.cpp:82:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &n, &m, &k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
shell.cpp:84:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", a + i);
   ~~~~~^~~~~~~~~~~~~
shell.cpp:88:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &l, &r);
   ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 45 / 45
• Subtask 3: 20 / 20
• Subtask 4: 25 / 25