BOJ 14402 - 야근 [C++]

문제

링크

풀이

#include <iostream>
#include <string>
#include <unordered_map>
using namespace std;
 
void solve(void) {
  int q; cin >> q;
  unordered_map<string, int> mp;
  while (q--) {
    string a, b; cin >> a >> b;
    if (b == "+") mp[a]++;
    else if (mp[a] == 0) mp[""]++;
    else mp[a]--;
  }
 
  for (auto &[k, v] : mp) {
    if (k == "") continue;
    mp[""] += v;
  }
  cout << mp[""];
}
 
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
 
  solve();
  return 0;
}