Wednesday, April 17, 2024

# odeforces Round #383 (Div. 2), problem: (C) Arpa’s loud Owf and Mehrdad’s evil plan Solution in C/C++

```#include<stdio.h>
int n, c[200], v[200];
int gcd(long long a, long long b)
{
if(b==0)
return a;
return gcd(b,a%b);
}
int main()
{
scanf("%i",&n);
for(int i=0;i<n;i++)
{
scanf("%i",c+i);
c[i]--;
}
long long l = 2;
for(int i=0;i<n && l>0;i++)
{
int t = 0;
for(int j=0;j<n;j++)
v[j]=0;
int j = i;
while(v[j]==0)
{
v[j]++;
j = c[j];
t++;
}
if(i==j)
l = l*t/gcd(l,t);
else
l = -2;
}
printf("%lli\n",l/2);
}```

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