botas-v2.c

#include <stdio.h>
 
int main(){
	int n, m, pares = 0, repeticao[31], i;
	char L, combinacoes[31];
	
	for(i = 0; i <= 30; i++) repeticao[i] = 0;	
	
	scanf("%i", &n);
	do{
		scanf("%i %c", &m, &L);	
		
		if(repeticao[m-30] > 0){
			repeticao[m-30]++;
			if(combinacoes[m-30] != L){ 
				pares++;
				repeticao[m-30]-=2;					
			}
		}else{
			combinacoes[m-30] = L;
			repeticao[m-30] = 1;
		}	
		
		if(n == 1){ 
			n = 0;
			scanf("%i", &n); 
			printf("%i\n", pares);
			pares = 0;
			for(i = 0; i <= 30; i++) repeticao[i] = 0;			
		}else n--;
		
	}while(n);
	
	return 0;
}