6G network

input/code.cpp: In function 'int main()':
input/code.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d", &N);
      |     ~~~~~^~~~~~~~~~
input/code.cpp: In member function 'void Point::read()':
input/code.cpp:9:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     void read(){ scanf("%lf %lf", &x, &y); }
      |                  ~~~~~^~~~~~~~~~~~~~~~~~~

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
const int maxN = 2e5+5;

struct Point {
    double x, y;
    void read(){ scanf("%lf %lf", &x, &y); }
    Point operator +(const Point& b) const { return Point{x+b.x, y+b.y}; }
    Point operator -(const Point& b) const { return Point{x-b.x, y-b.y}; }
    ll operator *(const Point& b) const { return (ll) x * b.y - (ll) y * b.x; }
    bool operator <(const Point& b) const { return x == b.x ? y < b.y : x < b.x; }
    void operator +=(const Point& b) { x += b.x; y += b.y; }
    void operator -=(const Point &b) { x -= b.x; y -= b.y; }
    void operator *=(const int k) { x *= k; y *= k; }

    ll cross(const Point& b, const Point& c) const {
        return (b - *this) * (c - *this);
    }
};

int N, S;
Point P[maxN];
vector<Point> hull;

int main(){
    scanf("%d", &N);
    for(int i = 0; i < N; i++)
        P[i].read();
    sort(P, P+N);

    for(int t = 0; t < 2; t++){
        for(int i = 0; i < N; i++){
            while((int) hull.size()-S >= 2){
                Point P1 = hull[hull.size()-2];
                Point P2 = hull[hull.size()-1];
                if(P1.cross(P2, P[i]) <= 0) break;
                hull.pop_back();
            }
            hull.push_back(P[i]);
        }
        hull.pop_back();
        S = hull.size();
        reverse(P, P+N);
    }

    double ans = INT_MAX;
    for (int i = 0; i < S-1; i++){
        double temp = 0;
        for (int j = i+1; j < S; j++){
            Point a, b;
            a = hull[i];
            b = hull[j];
            double d = hypot(a.x-b.x, a.y-b.y);
            temp = max(temp, d);
        }
        ans = min(ans, temp);
    }

    cout << ans;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

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Test 7

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Test 8

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Test 9

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Test 10

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Test 11

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Test 15

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Test 20

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Test 21

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Test 22

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Test 23

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Test 24

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Test 25

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Test 26

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Test 28

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Test 29

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Test 30

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Test 32

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Test 35

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Test 40

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Test 45

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Test 48

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Test 49

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Test 50

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Test 60

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Test 62

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Test 63

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Test 64

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Test 65

Verdict: WRONG ANSWER