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32 lines (30 loc) · 851 Bytes
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package leetcode.hard;
public final class P_76 {
public String minWindow(String s, String t) {
final int[] map = new int[256];
for (char c : t.toCharArray()) {
map[c]++;
}
int k = t.length();
final char[] w = s.toCharArray();
int j = 0;
int minL = (int) 1e9;
int minS = -1;
for (int i = 0; i < w.length; i++) {
if (map[w[i]]-- > 0) {
k--;
}
while (k == 0) {
final int currL = i - j + 1;
if (currL < minL) {
minL = currL;
minS = j;
}
if (++map[w[j++]] > 0) {
k++;
}
}
}
return minL == (int) 1e9 ? "" : s.substring(minS, minS + minL);
}
}