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My sublime text works for my c++ programs, but specifically doesn't show any output or successful build message for this prarticular program

#1 
#include <bits/stdc++.h>

using namespace std;

int solve() {
	int n;
	cin >> n;
	vector<int> a(n);
	for (int i = 0; i < n; ++i) {
		cin >> a[i];
	}

	if (count(a.begin(), a.end(), a[0]) == n) {
		cout << 1 << endl;
		for (int i = 0; i < n; ++i) {
			cout << 1 << " ";
		}
		cout << endl;
		return 0;
	}

	if (n % 2 == 0) {
		cout << 2 << endl;
		for (int i = 0; i < n; ++i) {
			cout << i % 2 + 1 << " ";
		}
		cout << endl;
		return 0;
	}

	for (int i = 0; i < n; ++i) {
		if (a[i] == a[(i + 1) % n]) {
			vector<int> ans(n);
			for (int j = 0, pos = i + 1; pos < n; ++pos, j ^= 1) {
				ans[pos] = j + 1;
			}
			for (int j = 0, pos = i; pos >= 0; --pos, j ^= 1) {
				ans[pos] = j + 1;
			}
			cout << 2 << endl;
			for (int pos = 0; pos < n; ++pos) {
				cout << ans[pos] << " ";
			}
			cout << endl;
			return 0;
		}
	}

	cout << 3 << endl;
	for (int i = 0; i < n - 1; ++i) {
		cout << i % 2 + 1 << " ";
	}
	cout << 3 << endl;
	return 0;
}

int main() {
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
	int q;
	cin >> q;
	for (int qq = 0; qq < q; qq++) {
		solve();
	}
	return 0;
}

When I try to build and run again (press Ctrl+B), I get a error permission denied which I resolve by killing the process. But the situatuion remains the same, with no output on next build.

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#2

The build system is an output-only command. Things like cin >> n; which block the process by expecting user input are not supported.

You can just run a compiler, but not the file itself. You’d need some kind of REPL to do so. There are several topics about this issue which might help you, even though they target different languages such as python.

The Terminus package can be configured as build system runner with input support for instance.

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