Just added name space std.
#include <string> #include <string_view> using namespace std; string reverse_string(string_view word){ return {word.rbegin(), word.rend()}; }- #include <string>
- #include <string_view>
std::string reverse_string(std::string_view word){- using namespace std;
- string reverse_string(string_view word){
- return {word.rbegin(), word.rend()};
- }
Arrays
just added the namespace to reduce the code length a bit;
#include <iostream> #include <vector> #include <algorithm> #include <cassert> using namespace std; int unique_sum(const vector<int>& n) { auto nums = n; sort(nums.begin(), nums.end(), [](int a, int b) { return a < b; }); int sum = 0; for(size_t i = 0; i < nums.size(); i++) { if(nums[i] == nums[i+1] || nums[i] == nums[i-1]) { continue; } else { sum += nums[i]; } } return sum; }- #include <iostream>
- #include <vector>
- #include <algorithm>
- #include <cassert>
int unique_sum(const std::vector<int>& n) {- using namespace std;
- int unique_sum(const vector<int>& n) {
- auto nums = n;
std::sort(nums.begin(), nums.end(), [](int a, int b) {- sort(nums.begin(), nums.end(), [](int a, int b) {
- return a < b;
- });
- int sum = 0;
- for(size_t i = 0; i < nums.size(); i++) {
- if(nums[i] == nums[i+1] || nums[i] == nums[i-1]) {
- continue;
- } else {
- sum += nums[i];
- }
- }
- return sum;
- }
Changed the for loop for a string builder. It's a little bit obscure but does still work.
public class ReverseString { public static String reverseString(String word) { StringBuilder result = new StringBuilder(); result.append(word);// adds the word to the string result.reverse();// you know REVERSES it return result.toString(); } }- public class ReverseString {
- public static String reverseString(String word) {
String reversedWord = "";for (int i = 0; i < word.length(); i++) {reversedWord = word.charAt(i) + reversedWord;- StringBuilder result = new StringBuilder();
- result.append(word);// adds the word to the string
- result.reverse();// you know REVERSES it
- return result.toString();
- }
return reversedWord;}- }
You only forgot to acctually call the method so your code does work!
import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.assertEquals; class ReverseStringTest { @Test public void testMonkey() { assertEquals("yeknom", ReverseString.reverseString( "monkey")); } @Test void testHome() { assertEquals("emoh", ReverseString.reverseString("home")); } @Test void testPneumonoultramicroscopicsilicovolcanoconiosis() { assertEquals("sisoinoconaclovociliscipocsorcimartluonomuenp", ReverseString.reverseString("pneumonoultramicroscopicsilicovolcanoconiosis")); } }- import org.junit.jupiter.api.Test;
- import static org.junit.jupiter.api.Assertions.assertEquals;
- class ReverseStringTest {
- @Test
- public void testMonkey() {
assertEquals("yeknom", "monkey");- assertEquals("yeknom", ReverseString.reverseString( "monkey"));
- }
- @Test
- void testHome() {
assertEquals("emoh", "home");- assertEquals("emoh", ReverseString.reverseString("home"));
- }
@Test- @Test
- void testPneumonoultramicroscopicsilicovolcanoconiosis() {
assertEquals("sisoinoconaclovociliscipocsorcimartluonomuenp", "pneumonoultramicroscopicsilicovolcanoconiosis");- assertEquals("sisoinoconaclovociliscipocsorcimartluonomuenp", ReverseString.reverseString("pneumonoultramicroscopicsilicovolcanoconiosis"));
- }
- }