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Submission #16867

# Submission time Handle Problem Language Result Execution time Memory
16867 2015-10-23T17:24:45 Z murat Beautiful row (IZhO12_beauty) C++
100 / 100
 2937 ms 165564 KB 
#include <bits/stdc++.h>

using namespace std;

#define dbgs(x) cerr << (#x) << " --> " << (x) << ' '
#define dbg(x) cerr << (#x) << " --> " << (x) << endl

#define foreach(i,x) for(type(x)i=x.begin();i!=x.end();i++)
#define FOR(ii,aa,bb) for(int ii=aa;ii<=bb;ii++)
#define ROF(ii,aa,bb) for(int ii=aa;ii>=bb;ii--)

#define type(x) __typeof(x.begin())

#define orta (bas + son >> 1)
#define sag (k + k + 1)
#define sol (k + k)

#define pb push_back
#define mp make_pair

#define nd second
#define st first

#define endl '\n'

typedef pair < int ,int > pii;

typedef long long ll;

const long long linf = 1e18+5;
const int mod = (int) 1e9 + 7;
const int logN = 17;
const int inf = 1e9;
const int N = 2e5 + 5;

ll F, dp[20][1 << 20];
int n, m, c[20][20], a[20];

int take2(int x) { int sum = 0; while(x) { sum += (x % 2 == 1); x /= 2; } return sum; }
int take3(int x) { int sum = 0; while(x) { sum += (x % 3 == 1); x /= 3; } return sum; }

ll f(int node, int mask) {
    if(mask == F) return 1;
    ll &r = dp[node][mask];
    if(r != -1) return r;
    r = 0;
    FOR(i, 0, n)
        if(!(mask & (1 << i)) && c[node][i])
            r += f(i, mask | (1 << i));
    return r;
}

int main() {
    scanf("%d",&n); F = (1 << n) - 1; --n;
    FOR(i, 0, n)
        scanf("%d", &a[i]);
    FOR(i, 0, n)
        FOR(j, 0, n)
            if(i != j && (take2(a[i]) == take2(a[j]) || take3(a[i]) == take3(a[j]))) {
                c[i][j] = 1;
            }
    memset(dp, -1, sizeof dp);
    ll ans = 0;
    FOR(i, 0, n)
        ans += f(i, (1 << i));
    cout << ans << endl;
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 165564 KB Output is correct
2 Correct 17 ms 165564 KB Output is correct
3 Correct 13 ms 165564 KB Output is correct
4 Correct 15 ms 165564 KB Output is correct
5 Correct 15 ms 165564 KB Output is correct
6 Correct 15 ms 165564 KB Output is correct
7 Correct 13 ms 165564 KB Output is correct
8 Correct 13 ms 165564 KB Output is correct
9 Correct 13 ms 165564 KB Output is correct
10 Correct 11 ms 165564 KB Output is correct
11 Correct 25 ms 165564 KB Output is correct
12 Correct 21 ms 165564 KB Output is correct
13 Correct 73 ms 165564 KB Output is correct
14 Correct 352 ms 165564 KB Output is correct
15 Correct 472 ms 165564 KB Output is correct
16 Correct 286 ms 165564 KB Output is correct
17 Correct 407 ms 165564 KB Output is correct
18 Correct 247 ms 165564 KB Output is correct
19 Correct 2490 ms 165564 KB Output is correct
20 Correct 2937 ms 165564 KB Output is correct