#include <stdio.h>
int main()
{
int n,i,suma=0,akt=0,ind=0;
int tablica[1111111];
scanf("%d",&n);
for(i = 0 ; i < n ; i++)
scanf("%d",&tablica[i]);
for(i = 0 ; i < n ; i++)
suma = suma + tablica[i];
for(ind = 0 ; ind < n ; ind++)
{
akt = akt + tablica[ind];
if (akt == suma - akt)
{
printf("Znaleziono srodek %d",ind+1);
return 0;
}
}
printf("-1");
return 0;
}
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