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  • solution/0000-0099/0005.Longest Palindromic Substring

1 file changed

+34
-34
lines changed
Lines changed: 34 additions & 34 deletions
Original file line numberDiff line numberDiff line change
@@ -1,45 +1,45 @@
11

22

3-
char *longestPalindrome(char *s) {
4-
int n = strlen(s);
5-
if (n == 0) {
6-
char *result = malloc(1);
7-
result[0] = '\0';
8-
return result;
9-
}
3+
char* longestPalindrome(char* s) {
4+
int n = strlen(s);
5+
if (n == 0) {
6+
char* result = malloc(1);
7+
result[0] = '\0';
8+
return result;
9+
}
1010

11-
bool dp[n][n];
12-
memset(dp, 0, sizeof(dp));
11+
bool dp[n][n];
12+
memset(dp, 0, sizeof(dp));
1313

14-
int start = 0, max_len = 1;
14+
int start = 0, max_len = 1;
1515

16-
for (int i = 0; i < n; i++) {
17-
dp[i][i] = true;
18-
}
16+
for (int i = 0; i < n; i++) {
17+
dp[i][i] = true;
18+
}
1919

20-
for (int i = 0; i < n - 1; i++) {
21-
if (s[i] == s[i + 1]) {
22-
dp[i][i + 1] = true;
23-
start = i;
24-
max_len = 2;
20+
for (int i = 0; i < n - 1; i++) {
21+
if (s[i] == s[i + 1]) {
22+
dp[i][i + 1] = true;
23+
start = i;
24+
max_len = 2;
25+
}
2526
}
26-
}
2727

28-
// Check for lengths > 2
29-
for (int len = 3; len <= n; len++) {
30-
for (int i = 0; i < n - len + 1; i++) {
31-
int j = i + len - 1;
32-
if (s[i] == s[j] && dp[i + 1][j - 1]) {
33-
dp[i][j] = true;
34-
if (len > max_len) {
35-
start = i;
36-
max_len = len;
28+
// Check for lengths > 2
29+
for (int len = 3; len <= n; len++) {
30+
for (int i = 0; i < n - len + 1; i++) {
31+
int j = i + len - 1;
32+
if (s[i] == s[j] && dp[i + 1][j - 1]) {
33+
dp[i][j] = true;
34+
if (len > max_len) {
35+
start = i;
36+
max_len = len;
37+
}
38+
}
3739
}
38-
}
3940
}
40-
}
41-
char *result = malloc(max_len + 1);
42-
strncpy(result, s + start, max_len);
43-
result[max_len] = '\0';
44-
return result;
41+
char* result = malloc(max_len + 1);
42+
strncpy(result, s + start, max_len);
43+
result[max_len] = '\0';
44+
return result;
4545
}

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