Embolden - Google Top Interview Questions
Problem Statement :
Given a string text and a list of strings patterns, implement an embolden function where all substrings in text that match any string in patterns are wrapped in <b> and </b> tags. If two patterns are adjacent or overlap, they should be merged into one tag. Constraints n < 5000 where n is the length of text m < 100 where m is the length of patterns Example 1 Input text = "abcdefg" patterns = ["bc", "ef"] Output "a<b>bc</b>d<b>ef</b>g" Explanation bc and ef match the text and are wrapped in <b> and </b> tags. Example 2 Input text = "abcdefg" patterns = ["bc", "de"] Output "a<b>bcde</b>fg" Explanation If two patterns are adjacent or overlap, they should be merged into one tag.
Solution :
Solution in C++ :
string solve(string text, vector<string>& patterns) {
vector<vector<int>> intervals;
int N = text.size();
for (int i = 0; i < N; i++) {
for (auto& p : patterns) {
if (p.size() <= N - i && text.compare(i, p.size(), p) == 0) {
if (intervals.empty()) {
intervals.push_back({i, i + p.size() - 1});
} else {
if (intervals.back()[1] >= i - 1)
intervals.back()[1] = i + p.size() - 1;
else
intervals.push_back({i, i + p.size() - 1});
}
}
}
}
string ans;
int idx = 0;
for (int i = 0; i < intervals.size(); i++) {
ans.append(text.substr(idx, intervals[i][0] - idx));
ans.append("<b>");
ans.append(text.substr(intervals[i][0], intervals[i][1] - intervals[i][0] + 1));
ans.append("</b>");
idx = intervals[i][1] + 1;
}
if (idx < text.size()) {
ans.append(text.substr(idx));
}
return ans;
}
Solution in Python :
class Solution:
def solve(self, text, patterns):
n = len(text)
bolded = [False] * n
for pat in patterns:
start = text.find(pat)
while start != -1:
for i in range(start, start + len(pat)):
bolded[i] = True
start = text.find(pat, start + 1)
ans = []
idx = 0
while idx < n:
if bolded[idx]:
ans.append("<b>")
while idx < n and bolded[idx]:
ans.append(text[idx])
idx += 1
ans.append("</b>")
else:
ans.append(text[idx])
idx += 1
return "".join(ans)
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