题解

#include <iostream>
#include <string>
#include <vector>
using namespace std;
vector<int> count_freq(string s) {
	vector<int> freq(26);
	for (char c : s) { freq[c - 'a']++; }
	return freq;
}

int main() {
	int n;
	cin >> n;
	vector<pair<string, string>> words(n);
	for (auto &[w1, w2] : words) { cin >> w1 >> w2; }

	vector<int> max_blocks(26);
	for (const auto &[w1, w2] : words) {
		vector<int> freq1 = count_freq(w1);
		vector<int> freq2 = count_freq(w2);
		for (int c = 0; c < 26; c++) {
			max_blocks[c] += max(freq1[c], freq2[c]);
		}
	}

	for (int i : max_blocks) { cout << i << '\n'; }
}