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May 1, 2024
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30 changes: 30 additions & 0 deletions 2000. Reverse Prefix of Word
Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
class Solution {
public:
string reversePrefix(string word, char ch) {
string ans;

// Find the index of the character 'ch' in the word
int ind = 0;
for(int i = 0; i < word.length(); i++){
if(word[i] == ch){
ind = i;
break;
}
}

// Push characters onto a stack until the index 'ind'
stack<char> st;
for(int i = 0; i <= ind; i++) st.push(word[i]);

// Pop characters from the stack to reverse the prefix
while(!st.empty()){
ans += st.top();
st.pop();
}

// Append the remaining characters after 'ch'
for(int i = ind+1; i < word.length(); i++) ans += word[i];

return ans;
}
};
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