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// 165. Compare Version Numbers
#include "leetcode.h"
/*
* given two version numbers 'version1' and 'version2', compare them. version
* numbers consist of one or more revisions joined by a dot. each revision
* consists of digits and may contain leading zeros. every revision contains at
* least one character. revisions are 0-indexed from left to right, right the
* leftmost revision being revision 0, the next revision being revision 1, and
* so on. to compare version numbers, use the following rules. if 'version1 <
* version2' return -1, if 'version1 > version2' return 1, otherwise, return 0
*/
int count_dot(char *s, int n) {
int dot = 0;
for (int i = 0; i < n; i++)
if (s[i] == '.')
dot++;
return dot;
}
void helper(char *s, int n, int *data) {
int val = 0, idx = 0;
for (int i = 0; i < n; i++)
if (s[i] == '.') {
data[idx] = val;
idx++;
val = 0;
} else {
val = val * 10 + s[i] - '0';
}
data[idx] = val;
}
int compareVersion(char *version1, char *version2) {
int n1 = strlen(version1), n2 = strlen(version2);
int p1 = 0, p2 = 0, ans = 0;
int item1 = count_dot(version1, n1) + 1;
int item2 = count_dot(version2, n2) + 1;
int *data1 = (int *)malloc(item1 * sizeof(int));
int *data2 = (int *)malloc(item2 * sizeof(int));
helper(version1, n1, data1);
helper(version2, n2, data2);
while (p1 < item1 || p2 < item2) {
if (p1 == item1) {
for (int i = p2; i < item2; i++)
if (!data2[i]) {
ans = -1;
goto exit;
}
ans = 0;
goto exit;
} else if (p2 == item2) {
for (int i = p1; i < item1; i++)
if (!data1[i]) {
ans = 1;
goto exit;
}
ans = 0;
goto exit;
} else {
if (data1[p1] > data2[p2]) {
ans = 1;
goto exit;
}
if (data1[p1] < data2[p2]) {
ans = -1;
goto exit;
}
p1++, p2++;
}
}
exit:
free(data1), free(data2);
return ans;
}
int main() {
char *v11 = "1.01", *v21 = "1.001", *v12 = "1.0", *v22 = "1.0.0",
*v13 = "0.1", *v23 = "1.1";
printf("%d\n", compareVersion(v11, v21)); // expect: 0
printf("%d\n", compareVersion(v12, v22)); // expect: 0
printf("%d\n", compareVersion(v13, v23)); // expect: -1
}
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