단어 공부

#include <iostream> #include <string> #include <map> #include <algorithm> #include <cctype> #include <utility> using namespace std; bool cmp(const pair<char, int> &a, const pair<char, int> &b) { return (a.second > b.second); } int main(void) { string input; map<char, int> m; char answer; int len; ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin >> input; len = input.size(); for (int i = 0; i < len; i++) { if (m.find(toupper(input[i])) != m.end()) m[toupper(input[i])]++; else m[toupper(input[i])] = 1; } vector<pair<char, int> > v(m.begin(), m.end()); sort(v.begin(), v.end(), cmp); if (v[0].second == v[1].second) answer = '?'; else answer = v[0].first; cout << answer; return (0); }