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- #include<bits/stdc++.h>
- using namespace std;
- int main () {
- //Pair
- vector<pair<int, int>> botas;
- botas.resize(61);
- int n; scanf("%d", &n);
- for (int i = 1; i <=n; i++){
- int tam;
- char lado;
- scanf("%d %c", &tam, &lado);
- if(lado == 'E'){
- botas[tam].first++;
- }
- else{
- botas[tam].second++;
- }
- }
- int pares = 0;
- for (int i = 30; i <= 60; i++){
- pares += min(botas[i].first, botas[i].second);
- }
- printf("%d", pares);
- }
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