C. Constanze’s Machine：题目

众所周知，斐波那契数列属于dp

#include <bits/stdc++.h>
using namespace std;
#define int long long
vector<int> a((int)6e5);
vector<int> b((int)6e5), c((int)6e5);
const int mod = 1e9 + 7;
map<int, int> mp1, mp2;
string str;
signed main()
{
    a[0] = a[1] = 1;
    a[2] = 2;
    a[3] = 3;
    for (int i = 4; i <= (int)1e5; i++)
        a[i] = (a[i - 1] + a[i - 2]) % mod;
    cin >> str;
    int n = str.length();
    str = "1" + str;
    int res = 1, ff = 1, cou = 0;
    for (int i = 1; i <= n; i++)
    {
        if (str[i] != str[i - 1])
            res = (res * a[cou]) % mod, cou = 0;
        if (str[i] == 'm' || str[i] == 'w')
            ff = 0;
        else if (str[i] == 'u')
            cou++;
        else if (str[i] == 'n')
            cou++;
    }
    res = (res * a[cou]) % mod;
    if (ff) cout << res << endl;
    else cout<<0<<endl;
}