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public boolean twoTwo(int[] nums) {
boolean result=false;
for(int i=0;i<nums.length-1;i++){
if((nums[i]==nums[i+1])||(nums[i]==nums[i-1])){
result=true;
}
else{
result=false;
}
}
return result;
}
Expected Run
twoTwo([4, 2, 2, 3]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2, 4]) → true true OK
twoTwo([2, 2, 4, 2]) → false false OK
twoTwo([1, 3, 4]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([1, 2, 2, 3, 4]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([1, 2, 3, 4]) → false Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2]) → true true OK
twoTwo([2, 2, 7]) → true true OK
twoTwo([2, 2, 7, 2, 1]) → false false OK
twoTwo([4, 2, 2, 2]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2, 2]) → true true OK
twoTwo([1, 2]) → false Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2]) → false false OK
twoTwo([1]) → true false X
twoTwo([]) → true false X
twoTwo([5, 2, 2, 3]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2, 5, 2]) → false false OK
other tests
X
Your progress graph for this problem
public boolean twoTwo(int[] nums) {
boolean result=false;
for(int i=1;i<nums.length-1;i++){
if((nums[i]==nums[i+1])||(nums[i]==nums[i-1])){
result=true;
}
else{
result=false;
}
}
return result;
}
Expected Run
twoTwo([4, 2, 2, 3]) → true true OK
twoTwo([2, 2, 4]) → true true OK
twoTwo([2, 2, 4, 2]) → false false OK
twoTwo([1, 3, 4]) → true false X
twoTwo([1, 2, 2, 3, 4]) → true false X
twoTwo([1, 2, 3, 4]) → false false OK
twoTwo([2, 2]) → true false X
twoTwo([2, 2, 7]) → true true OK
twoTwo([2, 2, 7, 2, 1]) → false false OK
twoTwo([4, 2, 2, 2]) → true true OK
twoTwo([2, 2, 2]) → true true OK
twoTwo([1, 2]) → false false OK
twoTwo([2]) → false false OK
twoTwo([1]) → true false X
twoTwo([]) → true false X
twoTwo([5, 2, 2, 3]) → true true OK
twoTwo([2, 2, 5, 2]) → false false OK
other tests
X
public boolean twoTwo(int[] nums) {
boolean result = true;
int consecutiveTwos = 0;
for(int num: nums){
if(num == 2){ // found a two
if(consecutiveTwos > 0){ // found twos adjacent to each other
consecutiveTwos++;
result = true;
}
else{ // found a single two
consecutiveTwos = 1;
result = false;
}
}
else{ // found a number that was not a two
if(consecutiveTwos == 1){ // there was a single two
result = false;
break; // break out of for loop
}
else{
consecutiveTwos = 0; // reset variable
}
}
}
return result;
}
twoTwo([1, 3, 4]) → true false X
Given an array of ints, return true if every 2 that appears in the array is next to another 2.
twoTwo([4, 2, 2, 3]) → true
twoTwo([2, 2, 4]) → true
twoTwo([2, 2, 4, 2]) → false
Given an array of ints, return true if every 2 that appears in the array is next to another 2.
or as challenge did not talk about below i should just blindly assume it is always true?Yes, I think that is what they had in mind. That is what the tests confirm.
twoTwo([1, 3, 4])]
public boolean twoTwo(int[] nums) {
boolean result=false;
for(int i=1;i<nums.length-1;i++){
if( (nums[i]==2) && (nums[i]==nums[i+1])||(nums[i]==nums[i-1])){
result=true;
}
else{
result=false;
}
}
return result;
}
Expected Run
twoTwo([4, 2, 2, 3]) → true true OK
twoTwo([2, 2, 4]) → true true OK
twoTwo([2, 2, 4, 2]) → false false OK
twoTwo([1, 3, 4]) → true false X
twoTwo([1, 2, 2, 3, 4]) → true false X
twoTwo([1, 2, 3, 4]) → false false OK
twoTwo([2, 2]) → true false X
twoTwo([2, 2, 7]) → true true OK
twoTwo([2, 2, 7, 2, 1]) → false false OK
twoTwo([4, 2, 2, 2]) → true true OK
twoTwo([2, 2, 2]) → true true OK
twoTwo([1, 2]) → false false OK
twoTwo([2]) → false false OK
twoTwo([1]) → true false X
twoTwo([]) → true false X
twoTwo([5, 2, 2, 3]) → true true OK
twoTwo([2, 2, 5, 2]) → false false OK
other tests
X
public boolean twoTwo(int[] nums) {
boolean result=false;
for(int i=0;i<nums.length-1;i++){
if( (nums[i]==2) && (nums[i]==nums[i+1])||(nums[i]==nums[i-1])){
result=true;
}
else{
result=false;
}
}
return result;
}
Expected Run
twoTwo([4, 2, 2, 3]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2, 4]) → true true OK
twoTwo([2, 2, 4, 2]) → false false OK
twoTwo([1, 3, 4]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([1, 2, 2, 3, 4]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([1, 2, 3, 4]) → false Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2]) → true true OK
twoTwo([2, 2, 7]) → true true OK
twoTwo([2, 2, 7, 2, 1]) → false false OK
twoTwo([4, 2, 2, 2]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2, 2]) → true true OK
twoTwo([1, 2]) → false Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2]) → false false OK
twoTwo([1]) → true false X
twoTwo([]) → true false X
twoTwo([5, 2, 2, 3]) → true Exception:java.lang.ArrayIndexOutOfB oundsExcep tion: -1 (line number:4) X
twoTwo([2, 2, 5, 2]) → false false OK
other tests
X
Your progress graph for this problem
int consecutiveTwos = 0;
for(int num: nums){
if(num == 2){ // found a two
if(consecutiveTwos > 0){ // found twos adjacent to each other
below is always 0 right and always false as we are initializing to 0 as int consecutiveTwos = 0;?
consecutiveTwos = 1;
On a subsequent pass through the loop, if another two is found then
consecutiveTwos > 0
will be true
public boolean twoTwo(int[] nums) {
boolean result = true;
int consecutiveTwos = 0;
for(int num: nums){
if(num == 2){ // found a two
if(consecutiveTwos == 0){ // found a single two
consecutiveTwos = 1;
result = false;
}
else{ // found twos adjacent to each other
consecutiveTwos++;
result = true;
}
}
else{ // found a number that was not a two
if(consecutiveTwos == 1){ // there was a single two
result = false;
break; // break out of for loop
}
else{
consecutiveTwos = 0; // reset variable
}
}
}
return result;
}
public boolean twoTwo(int[] nums) {
for (int i = 0; i < nums.length; i++) {
if (nums[i] == 2) {
if (i == (nums.length - 1) || nums[++i] != 2) {
return false;
}
while (i < nums.length && nums[i] == 2) {
i++;
}
}
}
return true;
}
public boolean twoTwo(int[] nums) {
for (int i = 0; i < nums.length; i++) {
if (accessArray(nums, i) == 2) {
if (accessArray(nums, i - 1) != 2 && accessArray(nums, i + 1) != 2) {
return false;
}
}
}
return true;
}
private int accessArray(int[] arr, int index) {
return index >= 0 && index < arr.length ? arr[index] : 0;
}
We only need to care if we find a 2, if it is at the end of the array or there is no 2 following it, return false. If it was followed by a 2, the "while" loop skips however many 2's are next to each other (so that it caters for 2, 2 and 2, 2, 2, 2, 2 in the same way)
private int accessArray(int[] arr, int index) {
return index >= 0 && index < arr.length ? arr[index] : 0;
}
for (int i = 0; i < nums.length; i++) {
if (accessArray(nums, i) == 2) {
if (accessArray(nums, i - 1) != 2 && accessArray(nums, i + 1) != 2) {
return false;
}
}
}
public boolean twoTwo(int[] nums) {
for (int i = 0; i < nums.length; i++) {
if (nums[i] == 2) {
if (i == (nums.length - 1) || nums[i++] != 2) {
return false;
}
while (i < nums.length && nums[i] == 2) {
i++;
}
}
}
return true;
}
Expected Run
twoTwo([4, 2, 2, 3]) → true true OK
twoTwo([2, 2, 4]) → true true OK
twoTwo([2, 2, 4, 2]) → false false OK
twoTwo([1, 3, 4]) → true true OK
twoTwo([1, 2, 2, 3, 4]) → true true OK
twoTwo([1, 2, 3, 4]) → false true X
twoTwo([2, 2]) → true true OK
twoTwo([2, 2, 7]) → true true OK
twoTwo([2, 2, 7, 2, 1]) → false true X
twoTwo([4, 2, 2, 2]) → true true OK
twoTwo([2, 2, 2]) → true true OK
twoTwo([1, 2]) → false false OK
twoTwo([2]) → false false OK
twoTwo([1]) → true true OK
twoTwo([]) → true true OK
twoTwo([5, 2, 2, 3]) → true true OK
twoTwo([2, 2, 5, 2]) → false false OK
other tests
OK
instead of ++i if i take i++ i am failing 2 test cases as below. i wonder why(just because increment is after assigment?)
int i,j;
i = 3;
j = i++;
System.out.println("i = " + i + " j = " + j);
i = 3;
j = ++i;
System.out.println("i = " + i + " j = " + j);
we only need to find ANY 2 not adjacent to another 2 ... and return falsecompare that to the challenge given by CodingBat
Given an array of ints, return true if every 2 that appears in the array is next to another 2.
I think we should let him decide how he wants to learn.
I personally prefer solutions with code rather than solutions without code which saves so much of time for me and and to experts.I agree. I definitely agree. That is the way I like to learn. I think having a bunch of solutions from a bunch of people is a very valuable resource. Given such a resource, I study each and every approach and try to learn how each contributor thinks. My favorite example is
public boolean twoTwo(int[] nums) {
boolean result=true;
for (int i = 0; i < nums.length; i++) {
if (nums[i] == 2) {
int count = 0;
for (int k = i; k < nums.length; k++) {
if (nums[k] == 2)
count++;
else
break;
}
i = i+count;
if (count < 2)
result=false;
}
}
return result;
}
public boolean twoTwo(int[] nums) {
for (int i = 0; i < nums.length; i++) {
if (nums[i] == 2) {
if (i == (nums.length - 1) || nums[++i] != 2) {
return false;
}
while (i < nums.length && nums[i] == 2) {
i++;
}
}
}
return true;
}
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Open in new window
Basic description...
We only need to care if we find a 2, if it is at the end of the array or there is no 2 following it, return false. If it was followed by a 2, the "while" loop skips however many 2's are next to each other (so that it caters for 2, 2 and 2, 2, 2, 2, 2 in the same way)
public boolean twoTwo(int[] nums) {
for (int i = 0; i < nums.length; i++) {
if (accessArray(nums, i) == 2) {
if (accessArray(nums, i - 1) != 2 && accessArray(nums, i + 1) != 2) {
return false;
}
}
}
return true;
}
private int accessArray(int[] arr, int index) {
return index >= 0 && index < arr.length ? arr[index] : 0;
}
i was not clear on above. please advise
if (accessArray(nums, i) == 2) {//check to see if nums[i] is 2 or not?
if (accessArray(nums, i - 1) != 2 && accessArray(nums, i + 1) != 2) {////check to see if nums[i-1] is not 2 and nums[i+1] os not 2 by calling that method which does some padding?
return false;
}
}
If the value we are looking at (based on i) is a 2 and the value before is NOT a 2 and the value after is NOT a 2, then return false. Or in different words, if the value pointed at by i is a 2 that is surrounded by non-2, return false.
return index >= 0 && index < arr.length ? arr[index] : 0;
if index >= 0 && index < arr.length is true then return arr[index]
otherwise if false then return 0?
pads with how many zero's before and after?
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