Submission #376258

#	Time	Username	Problem	Language	Result	Execution time	Memory
376258		dantoh000	Odašiljači (COCI20_odasiljaci)	C++14	70 / 70	66 ms	8664 KiB

odasiljaci

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef tuple<ll,int,int> iii;
int n;
int x[1005], y[1005];
vector<iii> edg;
int p[1005];
int rk[1005];
int nume = 0;
void init(int n){
    for (int i = 0; i < n; i++){
        p[i] = i;
        rk[i] = 0;
    }
}
int find(int x){
    return p[x] == x?  x : p[x] = find(p[x]);
}
void un(int x, int y){
    x = find(x) ,y = find(y);
    if (x == y) return;
    nume ++;
    if (rk[x] < rk[y]) swap(x,y);
    p[y] = x;
    if (rk[x] == rk[y]) rk[x]++;
}
int main(){
    scanf("%d",&n);
    for (int i = 0; i < n; i++){
        scanf("%d%d",&x[i],&y[i]);
    }
    for (int i = 0; i < n; i++){
        for (int j = i+1; j < n; j++){
            edg.emplace_back((ll)(y[i]-y[j])*(y[i]-y[j]) + (ll)(x[i]-x[j])*(x[i]-x[j]),i,j);
        }
    }
    init(n);
    sort(edg.begin(),edg.end());
    ll ans = 0;
    for (auto e : edg){
        ll d;
        int x,y;
        tie(d,x,y) = e;
        ans = d;
        un(x,y);
        //printf("%lld %d %d\n",d,x,y);
        if (nume == n-1) break;
    }
    printf("%.9Lf\n",pow((long double)ans, 0.5)/2);
}

Compilation message (stderr)

odasiljaci.cpp: In function 'int main()':
odasiljaci.cpp:29:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
odasiljaci.cpp:31:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |         scanf("%d%d",&x[i],&y[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 70 / 70