Submission #1919182

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Source Code Expand

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

// {U}{INT,LONG,LLONG}_{MAX,MIN}
#define INF         INT_MAX/3
#define MOD         (1000000007LL)

using LL  = long long;
// }}}

int main() {
    std::ios::sync_with_stdio(false);
    int n;cin >> n;
    vector<int> t(n), a(n);
    for(int i=0;i<n;i++) cin >> t[i];
    for(int i=0;i<n;i++) cin >> a[i];
    int l;
    for(l=n-1;l-1>=0;l--){
        if(t[l-1] < t[l]) break;
    }
    int r;
    for(r=0;r<n-1;r++){
        if(a[r] > a[r+1]) break;
    }
    if(r-l < 0){
        cout << 0 << endl;
        return 0;
    }
    vector<int> h(n);
    LL ans = 1;
    for(int i=0;i<n;i++) h[i] = min(t[i], a[i]);
    for(int i=1;i<n-1;i++){
        if(h[i-1] >= h[i] && h[i] <= h[i+1]){
            ans *= h[i];
            ans %= MOD;
        }
    }
    cout << ans << endl;
    return 0;
}

Submission Info

Judge Result