oj.uz

Submission #674138

# Submission time Handle Problem Language Result Execution time Memory
674138 2022-12-23T10:00:16 Z QwertyPi Shell (info1cup18_shell) C++14
100 / 100
 426 ms 88540 KB 
#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
using namespace std;

const int MOD = 1e9 + 7;
const int MAXN = 1e6 + 11;
vector<int> G[MAXN];
bool vis[MAXN];
vector<int> tp;
int n, m, p;
void dfs(int v){
	vis[v] = true;
	for(auto i : G[v]){
		if(!vis[i]) dfs(i);
	}
	tp.push_back(v);
}

int dp[MAXN], to[MAXN];

int32_t main(){
	cin.tie(0); cout.tie(0)->sync_with_stdio(false);
	cin >> n >> m >> p;
	vector<int> v; v.push_back(1);
	for(int i = 0; i < p; i++){
		int k; cin >> k; 
		if(k == 1){
			if(i == 0 || v.size() == 1) continue;
			cout << 0 << endl; return 0;
		}
		if(v.size() && k == v.back()) continue;
		v.push_back(k);
	}
	if(v.back() != n) v.push_back(n);
	vector<pair<int, int>> vp, vp2;
	for(int i = 0; i < m; i++){
		int u, v; cin >> u >> v;
		vp.push_back({u, v});
		G[u].push_back(v);
	}
	dfs(1);
	reverse(tp.begin(), tp.end());
	for(int i = 0; i < tp.size(); i++){
		to[tp[i]] = i + 1;
	}
	vector<int> d;
	for(int i = 0; i < v.size(); i++){
		if(to[v[i]] == 0){
			cout << 0 << endl; return 0;
		}
		if(i != 0 && to[v[i - 1]] > to[v[i]]){
			cout << 0 << endl; return 0;
		}
		d.push_back(to[v[i]]);
	}
	for(auto i : vp){
		if(to[i.fi] == 0 || to[i.se] == 0) continue;
		int f = to[i.fi], t = to[i.se];
		if(t > *upper_bound(d.begin(), d.end(), f)) continue;
		vp2.push_back({f, t});
	}
	sort(vp2.begin(), vp2.end());
	dp[1] = 1;
	for(auto i : vp2){
		dp[i.se] = (dp[i.fi] + dp[i.se]) % MOD;
	}
	cout << dp[to[n]] << endl;
}

Compilation message

shell.cpp: In function 'int32_t main()':
shell.cpp:45:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |  for(int i = 0; i < tp.size(); i++){
      |                 ~~^~~~~~~~~~~
shell.cpp:49:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |  for(int i = 0; i < v.size(); i++){
      |                 ~~^~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23768 KB Output is correct
3 Correct 13 ms 23808 KB Output is correct
4 Correct 12 ms 23764 KB Output is correct
5 Correct 15 ms 23820 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23768 KB Output is correct
3 Correct 13 ms 23808 KB Output is correct
4 Correct 12 ms 23764 KB Output is correct
5 Correct 15 ms 23820 KB Output is correct
6 Correct 15 ms 23892 KB Output is correct
7 Correct 22 ms 24988 KB Output is correct
8 Correct 15 ms 24476 KB Output is correct
9 Correct 20 ms 25556 KB Output is correct
10 Correct 22 ms 25352 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 23980 KB Output is correct
2 Correct 80 ms 36980 KB Output is correct
3 Correct 92 ms 43560 KB Output is correct
4 Correct 97 ms 49220 KB Output is correct
5 Correct 58 ms 35036 KB Output is correct
6 Correct 218 ms 80584 KB Output is correct
7 Correct 197 ms 67800 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23768 KB Output is correct
3 Correct 13 ms 23808 KB Output is correct
4 Correct 12 ms 23764 KB Output is correct
5 Correct 15 ms 23820 KB Output is correct
6 Correct 15 ms 23892 KB Output is correct
7 Correct 22 ms 24988 KB Output is correct
8 Correct 15 ms 24476 KB Output is correct
9 Correct 20 ms 25556 KB Output is correct
10 Correct 22 ms 25352 KB Output is correct
11 Correct 13 ms 23980 KB Output is correct
12 Correct 80 ms 36980 KB Output is correct
13 Correct 92 ms 43560 KB Output is correct
14 Correct 97 ms 49220 KB Output is correct
15 Correct 58 ms 35036 KB Output is correct
16 Correct 218 ms 80584 KB Output is correct
17 Correct 197 ms 67800 KB Output is correct
18 Correct 402 ms 88540 KB Output is correct
19 Correct 426 ms 85832 KB Output is correct
20 Correct 288 ms 81744 KB Output is correct
21 Correct 146 ms 54964 KB Output is correct
22 Correct 311 ms 84244 KB Output is correct