【计蒜客】2019 南昌邀请赛 J题

题解：hash+map。

比赛的时候没用hash，直接用map存字符串，竟然过了。。。

#include<bits/stdc++.h>
using namespace std;
typedef unsigned long long int ull;
string s[100005];
map<ull, int> mp;
int d[30];
void hash_(char s[])
{
	int slen = strlen(s);
	ull ans = 1, base = 131;
	for (int i = 0; i < slen; i++)
	{
		ans = (ull)s[i] + 1 + ans * base;//自动取模 
		mp[ans]++;
	}
	return;
}
int main()
{
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < 26; i++)
		scanf("%d", &d[i]);
	for (int i = 1; i <= n; i++)
	{
		char a[100005];
		cin >> s[i];
		for (int j = 0; j < s[i].length(); j++)
		{
			a[j] = s[i][j];
		}
		a[s[i].length()] = 0;
		hash_(a);
	}

	for (int i = 1; i <= n; i++)
	{
		ull temp_ans = 1, temp = 1, ans = 0;
		for (int j = 0; j < s[i].length(); j++)
		{
			temp_ans = (d[s[i][j] - 'a'] * temp_ans) % m;
		}
		ull ans__ = 1, base = 131;
		for (int j = 0; j < s[i].length(); j++)
		{
			temp = (d[s[i][j] - 'a'] * temp) % m;
			ans__ = (ull)s[i][j] + 1 + ans__ * base;//自动取模 
			if (temp > temp_ans)
			{
				ans += mp[ans__];
			}
		}
		cout << ans << ' ';
	}
	return 0;
}