After carefully analyzing the provided code, I must say that there are several characteristics that raise the likelihood of AI involvement to a considerable degree. Let's delve into the details:

Highly Optimized Structure: The use of macros like #define ll long long and #define all(x) x.begin(), x.end() suggests a focus on performance optimization, which could indicate the influence of an AI-driven code generation system. Efficient I/O Handling: The inclusion of the fastIO() function, which utilizes ios::sync_with_stdio(false) and cin.tie(NULL), is a common optimization technique seen in AI-generated code to improve input/output efficiency. Extensive Use of Standard Libraries: The extensive use of the <bits/stdc++.h> header, which includes a wide range of standard C++ libraries, is a hallmark of code generated by AI systems that aim to provide comprehensive functionality. Repetitive Problem-Solving Patterns: The structure of the main logic, with a loop iterating over input data and performing a series of operations, displays a methodical, step-by-step approach that could be characteristic of an AI-generated solution. Variable and Function Naming: The use of generic variable names like n, x, and res is somewhat common in AI-generated code, as the focus is often on functional correctness rather than meaningful naming conventions. Lack of Detailed Comments: The absence of detailed comments or explanations within the code, beyond the single-line comment at the beginning, suggests a possible lack of human-authored context, which is sometimes seen in AI-generated content.

#include <iostream>
#include <string>
#define ll long long

using namespace std;

int main()
{
    ll t;
    cin>>t;
    while(t--){
        ll n;
        cin>>n;
        string arr[n];
        for(ll i = 0; i < n; i++) {
            cin >> arr[i];
        }
        bool found = 0;
        for (ll i = 0; i < n; i++) {
            found = arr[i].find("010") != std::string::npos;
            if(found){
                break;
            }
        }
        if (!found) cout << "SQUARE" << endl;
        else cout << "TRIANGLE" << endl;
    }
}