#include <stdio.h>

void le_vetor(int v[], int n){
	for(int i = 0; i < (n-1); i++){
		scanf("%d\n", &v[i]);
	}
}

int busca(int valores[], int n, int chave){
	for(int i = 0; i < n; i++){
		if(valores[i] == chave){
			return i;
		} 
	} return -1;
} 

int main(){
	int n, chave;
	printf("Digite os valores de n e a chave\n");
	scanf("%d %d", &n, &chave);
	
	int v[n];
	le_vetor(v, n);
	printf("%d\n", busca(v, n, chave));
	return 0;
}

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