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Day7.java
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Day7.java
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import java.util.List;
public class Day7 {
// find valid TLS, ex abba and baab
static int part1(List<String> input) {
int count = 0;
for (String row : input) {
boolean found = false;
int bracketCount = 0;
for (int i = 0; i < row.length() - 3; i++) {
if (row.charAt(i) == '[' || row.charAt(i) == ']') {
bracketCount++;
}
else if (row.charAt(i) == row.charAt(i + 3) && row.charAt(i + 1) == row.charAt(i + 2)
&& row.charAt(i) != row.charAt(i + 1)) {
if (bracketCount % 2 == 1) {
found = false;
break;
}
else {
found = true;
}
}
}
if (found) {
count++;
}
}
return count;
}
// find valid SSL, ex aba and bab
static int part2(List<String> input) {
int count = 0;
for (String row : input) {
int i = 0;
int j = row.indexOf('[') + 1;
boolean ssl = isSSL(i, j, row);
if (ssl) {
count++;
}
}
return count;
}
private static boolean isSSL(int i, int j, String row) {
if (i > row.length() - 3 || j > row.length() - 3) {
return false;
}
boolean validI = row.charAt(i) == row.charAt(i + 2) && row.charAt(i) != row.charAt(i + 1);
while (!validI) {
if (i >= row.length() - 3) {
return false;
}
else if (row.charAt(i + 2) == '[') {
i = row.indexOf(']', i + 2);
if (i == -1) {
return false;
}
}
i++;
validI = row.charAt(i) == row.charAt(i + 2) && row.charAt(i) != row.charAt(i + 1);
}
boolean validJ = row.charAt(j) == row.charAt(j + 2) && row.charAt(j) != row.charAt(j + 1);
while (!validJ) {
if (j >= row.length() - 3) {
return false;
}
else if (row.charAt(j + 2) == ']') {
j = row.indexOf('[', j + 2);
if (j == -1)
return false;
}
j++;
validJ = row.charAt(j) == row.charAt(j + 2) && row.charAt(j) != row.charAt(j + 1);
}
boolean isSSL = row.charAt(i) == row.charAt(j + 1) && row.charAt(i + 1) == row.charAt(j);
return isSSL || isSSL(i + 1, j, row) || isSSL(i, j + 1, row);
}
}