Submission #312682

#	Time	Username	Problem	Language	Result	Execution time	Memory
312682		Trickster	Beautiful row (IZhO12_beauty)	C++14	0 / 100	1282 ms	262148 KiB

beauty

#include <algorithm>
#include <string.h>
#include <iostream>
#include <stdio.h>
#include <vector>
#include <queue>
#include <cmath>
#include <set>
#include <map>

using namespace std;

#define lm (1<<30)
#define N 200010
#define ff first
#define ss second
#define ll long long
#define pb push_back
#define mod 1000000007
#define pii pair <ll, ll>
#define sz(a) int(a.size())
// #pragma GCC target ("avx2")
// #pragma GCC optimization ("O3")
// #pragma GCC optimization ("unroll-loops")
ll bigmod(ll a,ll e) {if(e==0)return 1;ll x=bigmod(a*a%mod,e>>1);return e&1?x*a%mod:x;}

int n;
pii p[N];
int v[N];
int vis[N];
set <vector <int>> S;
vector <int> E[N][5], A;

void dfs(int x)
{
    if(x == n) {
        S.insert(A);
        return;
    }

    if(A.empty()) {
        for(int i = 1; i <= n; i++) {
            if(vis[i]) continue;

            vis[i] = 1;
            A.pb(i);
            dfs(x);
            vis[i] = 0;
            A.pop_back();
        }
    } else {
        int nd = A.back();
        for(auto i: E[nd][v[x]])
            if(vis[i] == 0) {
                vis[i] = 1;
                A.pb(i);
                dfs(x+1);
                vis[i] = 0;
                A.pop_back();
            } 
    }
}

void bit(int x)
{
    if(x == n) {
        dfs(1);

        return;
    }

    for(int i = 0; i < 2; i++) {
        v[x] = i;
        bit(x+1);
    }
}

int main()
{
    scanf("%d", &n);

    for(int i = 1; i <= n; i++) {
        scanf("%d", &v[i]);

        int x = v[i], cnt = 0;
        while(x) cnt += x%2, x/=2;

        p[i].ff = cnt;
        x = v[i], cnt = 0;
        while(x) cnt += (x%3 == 1 ? 1 : 0), x/=3;
        p[i].ss = cnt;
    }

    for(int i = 1; i <= n; i++)
        for(int h = 1; h <= n; h++) {
            if(p[i].ff == p[h].ff) E[i][0].pb(h);
            if(p[i].ss == p[h].ss) E[i][1].pb(h);
        }
    
    memset(v, 0, sizeof(v));
    bit(1);
    int sz = S.size();

    printf("%d", sz);
}

Compilation message (stderr)

beauty.cpp: In function 'int main()':
beauty.cpp:80:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   80 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
beauty.cpp:83:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   83 |         scanf("%d", &v[i]);
      |         ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 100