Classic 150 Interview Questions P383 Ransom Note

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Timeline

Timeline

2025-11-13

init

Hash table

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Problem:

P383 Ransom Note

https://leetcode.cn/problems/ransom-note/description/?envType=study-plan-v2&envId=top-interview-150

Hash table record

#include <string>
#include <unordered_map>
using std::string;
using std::unordered_map;

class Solution {
    public:
	bool canConstruct(string ransomNote, string magazine)
	{
		unordered_map<char, int> uset;
		for (auto &ch : magazine)
			uset[ch]++;

		for (auto &ch : ransomNote) {
			if (!uset.count(ch))
				return false;

			if (uset[ch] == 0)
				return false;
			
			uset[ch]--;
		}
		return true;
	}
};