Closest points

input/code.cpp: In function 'int main()':
input/code.cpp:28:32: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   28 |             && points[j].first >= points[i].first - d
input/code.cpp:29:33: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   29 |             && points[j].second >= points[i].second - d
input/code.cpp:30:33: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   30 |             && points[j].second <= points[i].second + d) {

#include <bits/stdc++.h>

using namespace std;

unsigned long long distance(pair<long long, long long> p1, pair<long long, long long> p2) {
    return (p1.first - p2.first)*(p1.first - p2.first) + (p1.second - p2.second)*(p1.second - p2.second);
}

int main() {

    int n;
    cin >> n;

    vector<pair<long long, long long>> points(n);
    for (int i = 0; i < n; i++) {
        cin >> points[i].first >> points[i].second;
    }

    sort(points.begin(), points.end());

    unsigned long long d = distance(points[0], points[1]);

    for (int i = 1; i < n; i++) {

        int j = i-1;

        while (j >= 0
            && points[j].first >= points[i].first - d
            && points[j].second >= points[i].second - d
            && points[j].second <= points[i].second + d) {

            unsigned long long dist = distance(points[i], points[i-1]);
        
            if (dist < d) {
                d = dist;
            }

            j -= 1; 

        }

    }

    cout << d << endl;

}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED