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Java Solution for LeetCode algorithm problems, continually updating
package g2201_2300.s2262_total_appeal_of_a_string;
// #Hard #String #Hash_Table #Dynamic_Programming
// #2022_06_15_Time_6_ms_(97.92%)_Space_48.3_MB_(80.72%)
import java.util.Arrays;
public class Solution {
public long appealSum(String s) {
int len = s.length();
int[] lastPos = new int[26];
Arrays.fill(lastPos, -1);
long res = 0;
for (int i = 0; i < len; i++) {
int idx = s.charAt(i) - 'a';
res += (i - lastPos[idx]) * (len - i);
lastPos[idx] = i;
}
return res;
}
}