1203A - Circle of Students - CodeForces Solution

implementation *1000

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Python Code: 


tests = int(input())
for _ in range(tests):
    students = int(input())
    ronde = [int(x) for x in input().split()]
    res = dict()
    for i, x in enumerate(ronde[:-1]):
        res[x - ronde[i + 1]] = res.get(x - ronde[i + 1], 0) + 1
    possible = True
    compte = -1
    for k, v in res.items():
        if k not in {-1, 1}:
            compte += 1
            if v > 1:
                possible = False
    if -1 in res and 1 in res:
        possible = False
    if compte > 0:
        possible = False
    if possible:
        print("YES")
    else:
        print("NO")

C++ Code: 

#include <bits/stdc++.h>
#define in(x) return void(cout << x)
using namespace std;
int a[1007];

void solve()
{
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i];

    /// !counter;

    int dem = 0;
    for (int i = 1; i < n; i++)
        dem += (a[i] > a[i + 1]);

    if ( (dem == 0) || (dem == 1 && a[n] < a[1]) ) in("YES\n");

    /// counter;

    dem = 0;
    for (int i = 1; i < n; i++)
        dem += (a[i] < a[i + 1]);

    if ( (dem == 0) || (dem == 1 && a[n] > a[1]) ) in("YES\n");

    cout << "NO\n";
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

    #define task "A"
    if (fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }

    int t;
    cin >> t;
    while (t--)
    {
        solve();
    }

    return 0;
}


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