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Java Solution for LeetCode algorithm problems, continually updating
package g0801_0900.s0816_ambiguous_coordinates;
// #Medium #String #Backtracking #2022_03_23_Time_4_ms_(98.95%)_Space_48.9_MB_(73.68%)
import java.util.ArrayList;
import java.util.List;
@SuppressWarnings("java:S107")
public class Solution {
public List ambiguousCoordinates(String s) {
char[] sc = s.toCharArray();
List result = new ArrayList<>();
StringBuilder sb = new StringBuilder();
for (int commaPos = 2; commaPos < sc.length - 1; commaPos++) {
if (isValidNum(sc, 1, commaPos - 1)) {
if (isValidNum(sc, commaPos, sc.length - 2)) {
buildNums(result, sb, sc, commaPos - 1, 0, commaPos, sc.length - 2, 0);
}
for (int dp2Idx = commaPos + 1; dp2Idx < sc.length - 1; dp2Idx++) {
if (isValidDPNum(sc, commaPos, sc.length - 2, dp2Idx)) {
buildNums(result, sb, sc, commaPos - 1, 0, commaPos, sc.length - 2, dp2Idx);
}
}
}
for (int dp1Idx = 2; dp1Idx < commaPos; dp1Idx++) {
if (isValidDPNum(sc, 1, commaPos - 1, dp1Idx)) {
if (isValidNum(sc, commaPos, sc.length - 2)) {
buildNums(result, sb, sc, commaPos - 1, dp1Idx, commaPos, sc.length - 2, 0);
}
for (int dp2Idx = commaPos + 1; dp2Idx < sc.length - 1; dp2Idx++) {
if (isValidDPNum(sc, commaPos, sc.length - 2, dp2Idx)) {
buildNums(
result,
sb,
sc,
commaPos - 1,
dp1Idx,
commaPos,
sc.length - 2,
dp2Idx);
}
}
}
}
}
return result;
}
private boolean isValidNum(char[] sc, int startIdx, int lastIdx) {
return sc[startIdx] != '0' || lastIdx - startIdx == 0;
}
private boolean isValidDPNum(char[] sc, int startIdx, int lastIdx, int dpIdx) {
return (sc[startIdx] != '0' || dpIdx - startIdx == 1) && sc[lastIdx] != '0';
}
private void buildNums(
List result,
StringBuilder sb,
char[] sc,
int last1Idx,
int dp1Idx,
int start2Idx,
int last2Idx,
int dp2Idx) {
sb.setLength(0);
sb.append('(');
if (dp1Idx == 0) {
sb.append(sc, 1, last1Idx - 1 + 1);
} else {
sb.append(sc, 1, dp1Idx - 1).append('.').append(sc, dp1Idx, last1Idx - dp1Idx + 1);
}
sb.append(',').append(' ');
if (dp2Idx == 0) {
sb.append(sc, start2Idx, last2Idx - start2Idx + 1);
} else {
sb.append(sc, start2Idx, dp2Idx - start2Idx)
.append('.')
.append(sc, dp2Idx, last2Idx - dp2Idx + 1);
}
sb.append(')');
result.add(sb.toString());
}
}