Submission #95345

#	Time	Username	Problem	Language	Result	Execution time	Memory
95345		dalgerok	Shell (info1cup18_shell)	C++14	100 / 100	350 ms	47844 KiB

shell

#include<bits/stdc++.h>
using namespace std;



const int N = 1e6 + 5, MOD = 1e9 + 7;



int n, m, p, a[N], dp[N], ans[N];
vector < int > g[N];

void dfs(int v){
    if(v == n){
        dp[v] = ans[v] = 1;
    }
    else{
        for(int to : g[v]){
            if(dp[to] == 0){
                dfs(to);
            }
            if(dp[to] > dp[v]){
                dp[v] = dp[to];
                ans[v] = ans[to];
            }
            else if(dp[to] == dp[v]){
                ans[v] += ans[to];
                if(ans[v] >= MOD){
                    ans[v] -= MOD;
                }
            }
        }
    }
    if(v == a[p - dp[v] + 1]){
        dp[v] += 1;
    }
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> m >> p;
    for(int i = 1; i <= p; i++){
        cin >> a[i];
    }
    for(int i = 1; i <= m; i++){
        int x, y;
        cin >> x >> y;
        g[x].push_back(y);
    }
    dfs(1);
    cout << ans[1];
}

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