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Update Minimum Window Substring.cpp #27

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Update Minimum Window Substring.cpp #27

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36 changes: 36 additions & 0 deletions Sliding Window/Minimum Window Substring.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -44,3 +44,39 @@ class Solution {
return minWindow == INT_MAX ? "" : s.substr(minStart, minWindow);
}
};

// Java code:
class Solution {
public String minWindow(String s, String t) {
int n = s.length();
Map<Character, Integer> mp = new HashMap<>();
for(char ch : t.toCharArray()) {
mp.put(ch, mp.getOrDefault(ch, 0) + 1);
}
int requiredCount = t.length();
int i = 0, j = 0;
int minStart = 0;
int minWindow = Integer.MAX_VALUE;
while(j < n) {
char ch_j = s.charAt(j);
if(mp.getOrDefault(ch_j, 0) > 0)
requiredCount--;
mp.put(ch_j, mp.getOrDefault(ch_j, 0) - 1);
while(requiredCount == 0) {
if(minWindow > j - i + 1) {
minWindow = j - i + 1;
minStart = i;
}
char ch_i = s.charAt(i);
mp.put(ch_i, mp.get(ch_i) + 1);
if(mp.get(ch_i) > 0)
requiredCount++;
i++;
}
j++;
}
return minWindow == Integer.MAX_VALUE ? "" : s.substring(minStart, minStart + minWindow);
}
}