Submission #339631

#	Time	Username	Problem	Language	Result	Execution time	Memory
339631		Ahmad_Hasan	Beautiful row (IZhO12_beauty)	C++17	0 / 100	1 ms	364 KiB

beauty

#include <bits/stdc++.h>

using namespace std;

int n;
int nums[25];
int cnt=0;
vector<vector<int> > dp;
int slv(int msk=0,int lstidx=-1){



    if(msk==(1<<n)-1){
        return 1;
    }
    int cnt=0;
    if(lstidx!=-1&&dp[msk][lstidx]!=-1)
        return dp[msk][lstidx];
    for(int i=0;i<n;i++){
        if(!(msk&(1<<i))){
            if(lstidx==-1){
                cnt+=slv(msk|(1<<i),i);
                continue;
            }
            int f=0;
            {
                int num1=nums[lstidx];
                int num2=nums[i];
                int cntb2=0;
                while(num1||num2){
                    cntb2-=num1%2;
                    cntb2+=num2%2;
                    num1/=2;
                    num2/=2;
                }
                if(!cntb2){
                    f=1;
                }
                num1=nums[lstidx];
                num2=nums[i];
                int cntb3=0;
                while(num1||num2){
                    cntb3-=num1%3==1;
                    cntb3+=num2%3==1;
                    num1/=3;
                    num2/=3;
                }
                if(!cntb3){
                    f=1;
                }
            }
            if(f){
                cnt+=slv(msk|(1<<i),i);
            }
        }
    }
    return dp[msk][lstidx]=cnt;
}


int main()
{
    freopen("stdin.in","r",stdin);
    freopen("stdout.out","w",stdout);
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>nums[i];
    }
    dp=vector<vector<int> >((1<<n)+5,vector<int>(n+5,-1));

    cout<<slv();


    return 0;
}
/****

1
8 4
3 1
4 3
1 8
8 7

1
100 9
1 100
2 1
3 2
4 3
5 4
100 99
99 98
98 97
97 96



19 3 6
3 12 9


2000000000 1000000000 1000000000
3 1000000000 1000000000

*/

Compilation message (stderr)

beauty.cpp: In function 'int main()':
beauty.cpp:63:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   63 |     freopen("stdin.in","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
beauty.cpp:64:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   64 |     freopen("stdout.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100