Simplified Sudoku

input/code.cpp: In function 'int main()':
input/code.cpp:28:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (st.size() != n) {
       ~~~~~~~~~~^~~~
input/code.cpp:37:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (st.size() != n) {
       ~~~~~~~~~~^~~~

#include <iostream>
#include <set>

using namespace std;

int n;
int t[105][105];

void fail() {
	cout << "NO\n";
	exit(0);
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cin >> n;
	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < n; ++j) {
			cin >> t[i][j];
		}
	}
	for (int i = 0; i < n; ++i) {
		set<int> st;
		for (int j = 0; j < n; ++j) {
			st.insert(t[i][j]);
		}
		if (st.size() != n) {
			fail();
		}
	}
	for (int j = 0; j < n; ++j) {
		set<int> st;
		for (int i = 0; i < n; ++i) {
			st.insert(t[i][j]);
		}
		if (st.size() != n) {
			fail();
		}
	}
	cout << "YES\n";
	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED