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程式語言 - LeetCode - C++ - 3120. Count the Number of Special Characters I
題目:

解答:
class Solution {
public:
int numberOfSpecialChars(string word) {
unordered_set<char> lower;
unordered_set<char> upper;
for (char c : word) {
if (islower(c)) {
lower.insert(c);
}
else {
upper.insert(c);
}
}
int ans = 0;
for (char c : lower) {
if (upper.count(toupper(c))) {
ans += 1;
}
}
return ans;
}
};