Submission #163504

# Submission time Handle Problem Language Result Execution time Memory
163504 2019-11-13T15:06:52 Z tselmegkh Beautiful row (IZhO12_beauty) C++14
0 / 100
142 ms 164536 KB
#include<bits/stdc++.h>
using namespace std;

vector<int> binary[33], trinary[33];
vector<int> a;
int n;

int count(int x){
	int res = 0;
	while(x > 0){
		if(x % 3 == 1){
			res++;
		}
		x /= 3;
	}
	return res;
}

long long dp[(1 << 20)][20];
long long solve(int mask, int last){
	if(mask == ((1 << n) - 1)){
		return 1;
	}
	long long ans = 0;
	if(mask == 0){
		for(int j = 0; j < n; j++){
			int curmask = mask | (1 << j);
			ans += solve(curmask, j);
		}
	}
	else{
		if(dp[mask][last] != -1)return 0;
		int binaryones = __builtin_popcount(a[last]), trinaryones = count(a[last]);
		for(int j = 0; j < binary[binaryones].size(); j++){
			int k = binary[binaryones][j];
			if(mask & (1 << k))continue;
			int curmask = mask | (1 << k);
			ans += solve(curmask, k);
		}
		for(int j = 0; j < trinary[trinaryones].size(); j++){
			int k = trinary[trinaryones][j];
			if(mask & (1 << k))continue;
			int curmask = mask | (1 << k);
			if(!(binaryones == __builtin_popcount(a[k])))ans += solve(curmask, k);
		}
	}
	return dp[mask][last] = ans;
}
int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin >> n;
	a.resize(n);

	for(int i = 0; i < n; i++){
		cin >> a[i];
		int cnt3 = count(a[i]), cnt2 = __builtin_popcount(a[i]);
		binary[cnt2].push_back(i);
		trinary[cnt3].push_back(i);
	}
	memset(dp, -1, sizeof dp);

	cout << solve(0, 0) << '\n';
}

Compilation message

beauty.cpp: In function 'long long int solve(int, int)':
beauty.cpp:34:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0; j < binary[binaryones].size(); j++){
                  ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
beauty.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0; j < trinary[trinaryones].size(); j++){
                  ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Verdict Execution time Memory Grader output
1 Correct 142 ms 164472 KB Output is correct
2 Correct 141 ms 164536 KB Output is correct
3 Incorrect 142 ms 164472 KB Output isn't correct
4 Halted 0 ms 0 KB -