Submission #337968

#	Time	Username	Problem	Language	Result	Execution time	Memory
337968		Kerim	Beautiful row (IZhO12_beauty)	C++17	100 / 100	2708 ms	164716 KiB

beauty

#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
int n,all,two[22],three[22];
ll dp[1<<20][20];
ll rec(int mask,int last){
	if(mask==all)return 1;
	ll &ret=dp[mask][last];
	if(~ret)
		return ret;ret=0;
	for(int i=0;i<n;i++)
		if(!(mask>>i&1) and (two[i]==two[last] or three[i]==three[last]))
			ret+=rec(mask|(1<<i),i);
	return ret;	
}
int main(){
  //  freopen("file.in", "r", stdin);
    memset(dp,-1,sizeof dp);
    scanf("%d",&n);all=(1<<n)-1;
    for(int i=0;i<n;i++){
    	int x,xx;
		scanf("%d",&x);xx=x;
		while(x>=1){
			if(x%2==1)
				two[i]++;
			x/=2;
		}x=xx;
		while(x>=1){
			if(x%3==1)
				three[i]++;
			x/=3;	
		}
    }
    ll ans=0;
    for(int i=0;i<n;i++)
    	ans+=rec(1<<i,i);
    printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

beauty.cpp: In function 'll rec(int, int)':
beauty.cpp:25:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   25 |  if(~ret)
      |  ^~
beauty.cpp:26:14: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   26 |   return ret;ret=0;
      |              ^~~
beauty.cpp: In function 'int main()':
beauty.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |     scanf("%d",&n);all=(1<<n)-1;
      |     ~~~~~^~~~~~~~~
beauty.cpp:38:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |   scanf("%d",&x);xx=x;
      |   ~~~~~^~~~~~~~~

• Subtask 1: 100 / 100