Submission #891785

#	Time	Username	Problem	Language	Result	Execution time	Memory
891785		harao	Vještica (COCI16_vjestica)	C++17	160 / 160	311 ms	1332 KiB

vjestica

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

const int N = (1 << 17);

int n;
int a[100][30], s[20];
int dp[N], f[N];

int calc(int mask)
{
	if(dp[mask] != -1) return dp[mask];
	if(mask == 0) return 0;
	if(__builtin_popcount(mask) == 1)
	{
		int i = 0;
		for(i; i < n; i++)
			if((mask >> i) & 1)break;
		return s[i];
	}

	for(int j = 0;j < 26; j ++)
	{
		int x = 1e9 + 7;
		for(int i = 0; i < n; i ++)
			if((mask >> i) & 1)
				x = min(a[i][j], x);
		f[mask] += x;
	}


	int ans = 1e9 + 7;

	for(int i = (mask - 1) & mask; i > 0; i = (i - 1) & mask)
		ans = min(ans, calc(i) + calc(mask ^ i) - f[mask]);

	return dp[mask] = ans;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

//    freopen(".inp", "r", stdin);
//    freopen(".out", "w", stdout);

	memset(dp, -1, sizeof dp);
	cin >> n;
	for(int i = 0; i < n; i++)
	{
		string t;
		cin >> t;
		s[i] = t.size();
		for(char c : t) a[i][c - 'a'] ++;
	}
	cout << calc((1 << n) - 1) + 1;
	return 0;
}

Compilation message (stderr)

vjestica.cpp: In function 'int calc(int)':
vjestica.cpp:17:7: warning: statement has no effect [-Wunused-value]
   17 |   for(i; i < n; i++)
      |       ^

• Subtask 1: 160 / 160