#include <stdio.h>
int acc(int x){
static int sum=0;
static int count=0;
if(x>=0)
{
sum+=x;
count++;
return sum;
}
else if(x==-1)
{
return sum;
}
else if(x==-2)
{
return count;
}
else
{
return -1;
}
}
int main(void) {
return 0;
}
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