Hello Programmers, In this post, you will learn how to solve HackerRank Happy Ladybugs Solution. This problem is a part of the HackerRank Algorithms Series.
One more thing to add, don’t directly look for the solutions, first try to solve the problems of Hackerrank by yourself. If you find any difficulty after trying several times, then you can look for solutions.
HackerRank Happy Ladybugs Solution
Task
Happy Ladybugs is a board game having the following properties:
- The board is represented by a string, b, of length n. The ith character of the string, b[i], denotes the ith cell of the board.
- A ladybug is happy only when its left or right adjacent cell (i.e., b[i+1]) is occupied by another ladybug having the same color.
- In a single move, you can move a ladybug from its current position to any empty cell.
Given the values of n and b for g games of Happy Ladybugs, determine if it’s possible to make all the ladybugs happy. For each game, return YES if all the ladybugs can be made happy through some number of moves. Otherwise, return NO.
Example
b = [Y Y R_B_BR]
You can move the rightmost B and R to make b = [YYRRBB . . . ] and all the ladybugs are happy. Return YES.
Function Description
Complete the happyLadybugs function in the editor below.
happyLadybugs has the following parameters:
- string b: the initial positions and colors of the ladybugs
Returns
- string: either
YESorNO
Input Format
The first line contains an integer g, the number of games.
The next g pairs of lines are in the following format:
- The first line contains an integer n, the number of cells on the board.
- The second line contains a string b that describes the n cells of the board.
Constraints
- 1 <= g, n <= 100
- b[i] ∈ {ascii[A – Z]}
Sample Input 0
4 7 RBY_YBR 6 X_Y__X 2 __ 6 B_RRBR
Sample Output 0
YES NO YES YES
Explanation 0
The four games of Happy Ladybugs are explained below:
- Initial board:
After the first move:
After the second move:
After the third move:
Now all the ladybugs are happy, so we print YES on a new line.
- Initial board: Now all the ladybugs are happy, so we print
YESon a new line. - There is no way to make the ladybug having color
Yhappy, so we printNOon a new line. - There are no unhappy ladybugs, so we print
YESon a new line. - Move the rightmost B and R to form b = [BBRRR . . . ].
Sample Input 1
5 5 AABBC 7 AABBC_C 1 _ 10 DD__FQ_QQF 6 AABCBC
Sample Output 1
NO YES YES YES NO
HackerRank Happy Ladybugs Solution
Happy Ladybugs Solution in C
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
int main(){
int Q;
int ban = 0, i, j, cont, min;
int C[ 29 ];
scanf("%d",&Q);
for(int a0 = 0; a0 < Q; a0++){
int n;
scanf("%d",&n);
char* b = (char *)malloc(512000 * sizeof(char));
scanf("%s",b);
min = n+1;
for( i = 0; i<n && b[ i ] != '_'; i++ ){
cont = 0;
if( b[ i ] != '_' ){
j = i+1;
cont++;
while( b[ j ] == b[ i ] ){ cont++; j++; }
i = j-1;
min = (min > cont )?cont:min;
}
}
if( min == 1 && i == n ){ printf("NO\n"); continue; }
for( i = 0; i<28; i++ ) C[ i ] = 0;
for( i = 0; i<n; i++ ) C[ b[ i ] - 'A']++;
for( i = 0; i<28 && C[ i ] != 1; i++ ) ;
if( i < 28 ){ printf("NO\n"); continue;}
printf("YES\n");
}
return 0;
}Happy Ladybugs Solution in Cpp
#include <cstdio>
#include <vector>
#include <string>
#include <queue>
#include <map>
#include <set>
#include <algorithm>
using namespace std;
#define REP(i, n) for (int i=0, ___=(n); i<___; ++i)
#define FOR(i, a, b) for (int i=(a), ___=(b); i<=___; ++i)
#define FORD(i, a, b) for (int i=(a), ___=(b); i>=___; --i)
int read() { int n; scanf("%d", &n); return n; }
long long readl() { long long n; scanf("%lld", &n); return n; }
double readd() { double d; scanf("%lf", &d); return d; }
///////////////////////////////////////
/// WITHOUT STL
// kopiec
#define HeapT int
#define heapLeft(i) (2*(i)+1)
#define heapRight(i) (2*(i)+2)
#define heapParent(i) (((i)-1)/2)
inline void swap(HeapT &a, HeapT &b) {
HeapT t = a; a = b; b = t;
}
inline void heapDown(HeapT *h, int a, int n) {
while (heapLeft(a) < n) {
int b = heapLeft(a);
if (b+1 < n && h[b+1] > h[b]) b++;
if (h[b] <= h[a]) break;
swap(h[a], h[b]);
a = b;
}
}
inline void heapUp(HeapT *h, int a) {
while (a > 0) {
int b = heapParent(a);
if (h[a] > h[b]) {
swap(h[a], h[b]);
a = b;
}
}
}
void heapMake(HeapT *h, int n) {
for (int a=heapParent(n-1); a>=0; --a)
heapDown(h, a, n);
}
void heapSort(HeapT *h, int n) {
heapMake(h, n);
for (int a=n-1; a>0; --a) {
swap(h[0], h[a]);
heapDown(h, 0, a);
}
}
///////////////////////////////////////
bool f() {
int n = read();
char s[111];
scanf("%s", s);
map<char, int> m;
REP(i, n) m[s[i]]++;
if (m.count('_') > 0) {
FOR(c, 'A', 'Z') if (m[c] == 1) return false;
return true;
}
REP(i, n) {
bool ok = false;
if (i-1 >= 0 && s[i-1] == s[i]) ok = true;
if (s[i+1] == s[i]) ok = true;
if (!ok) return false;
}
return true;
}
int main() {
int t = read();
while (t--) {
printf("%s\n", f() ? "YES" : "NO");
}
return 0;
}Happy Ladybugs Solution in Java
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int Q = in.nextInt();
for(int a0 = 0; a0 < Q; a0++){
char[] counts = new char[256];
int n = in.nextInt();
String b = in.next();
for (char c : b.toCharArray()) {
counts[c]++;
}
if (counts['_']==0) {
String pr = "YES";
for (int i = 0; i < n; i++) {
if ((i==0||b.charAt(i)!=b.charAt(i-1))&&(i==n-1||b.charAt(i)!=b.charAt(i+1)))
pr = "NO";
}
System.out.println(pr);
} else {
String pr = "YES";
for (int i = 0; i < 256; i++) {
if (i != (int)'_' && counts[i]==1)
pr = "NO";
}
System.out.println(pr);
}
}
}
}
Happy Ladybugs Solution in Python
#!/bin/python
import sys
from collections import Counter
from string import ascii_uppercase
Q = int(raw_input().strip())
for a0 in xrange(Q):
n = int(raw_input().strip())
b = raw_input().strip()
c = Counter(b)
balanced = True
for key, value in c.iteritems():
if key in ascii_uppercase and value > 1:
continue
elif key == '_':
continue
else:
balanced = False
if not balanced:
print 'NO'
continue
if '_' not in b:
bounds = []
for char in b:
if bounds == []:
bounds.append([char])
continue
if char == bounds[-1][-1]:
bounds[-1].append(char)
else:
bounds.append([char])
balanced = True
for bound in bounds:
if len(bound) < 2:
balanced = False
break
print 'YES' if balanced else 'NO'
else:
print 'YES'Happy Ladybugs Solution using JavaScript
process.stdin.resume();
process.stdin.setEncoding('ascii');
var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;
process.stdin.on('data', function (data) {
input_stdin += data;
});
process.stdin.on('end', function () {
input_stdin_array = input_stdin.split("\n");
main();
});
function readLine() {
return input_stdin_array[input_currentline++];
}
/////////////// ignore above this line ////////////////////
function main() {
var Q = parseInt(readLine());
for(var a0 = 0; a0 < Q; a0++){
var n = parseInt(readLine());
var bugs = {};
var prev = '';
var b = readLine().split('');
var hasEmptyCells = b.indexOf('_') > -1;
var result = 'YES';
b.forEach(char => {
if (prev && prev === char) {
bugs[char][bugs[char].length-1]++;
} else {
prev = char;
if (!bugs[char]) {
bugs[char] = [];
}
bugs[char].push(1);
}
});
delete bugs['_'];
Object.keys(bugs).forEach(bugColor => {
let total = bugs[bugColor].reduce((prev, curr) => prev + curr, 0);
let hasUnhappyBugs = bugs[bugColor].filter(x => x === 1).length > 0;
if ((total === 1) || (hasUnhappyBugs && !hasEmptyCells)) {
result = 'NO';
}
});
/*
{
R: [1, 1]
B: [1, 1]
Y: [1, 1]
_: [1]
}
*/
process.stdout.write(result + '\n');
}
}Happy Ladybugs Solution in Scala
object Solution {
def checkHappy(s: String) = {
if (s(0) != s(1)) false
else {
val n = s.length - 1
if (s(n) != s(n - 1)) false
else (1 until n).map(i => s(i) == s(i - 1) || s(i) == s(i + 1)).forall(_ == true)
}
}
def main(args: Array[String]) {
val sc = new java.util.Scanner (System.in);
var Q = sc.nextInt();
var a0 = 0;
while(a0 < Q){
var n = sc.nextInt();
var b = sc.next();
val colors = b.toSet;
val nums = colors.filter(_ != '_').map(c => b.count(_ == c))
if (nums.exists(_ == 1)) {
println("NO")
}
else {
if (b.contains('_')) {
println("YES")
}
else {
if (checkHappy(b)) println("YES")
else println("NO")
}
}
a0+=1;
}
}
}Happy Ladybugs Solution in Pascal
Var
s:string; a:array[0..26] of byte; n,f,l,i,j:byte;
Begin
Readln(n);
For i:=1 to n do
begin
For j:=0 to 26 do a[j]:=0;
f:=0;
readln(l);
readln(s);
For j:=1 to l do
begin
if s[j]='_' then inc(a[26])
else inc(a[ord(s[j])-ord('A')]);
end;
if a[26]=0 then
begin
for j:=1 to l do if (s[j]=s[j+1]) or (s[j]=s[j-1]) then inc(f);
if f=l then writeln('YES')
else writeln('NO')
end
else
begin
for j:=0 to 25 do if a[j]=1 then inc(f);
if f>0 then writeln('NO')
else writeln('YES');
end;
end;
End.Disclaimer: This problem (Happy Ladybugs) is generated by HackerRank but the Solution is Provided by BrokenProgrammers. This tutorial is only for Educational and Learning purposes.