initial commit

492B Vanya and Lanterns/492B.cpp

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+#include<bits/stdc++.h>
+using namespace std;
+
+#define ll          long long
+#define ul          unsigned long long
+#define pb          push_back
+#define ss          second
+#define ff          first
+#define fr(m)       for(int i=0; i<m; ++i)
+#define fro(m)      for(int i=1; i<m; ++i)
+#define frj(m)      for(int j=0; j<m; ++j)
+#define frr(n)      for(int i=n; i>=0; --i)
+#define nl          '\n'
+#define yes         cout<<"YES"<<nl
+#define no          cout<<"NO"<<nl
+#define all(x)      x.begin(), x.end()
+#define dbg(x)    cerr << #x <<" "<< x << endl;
+#define fast_io  (ios_base:: sync_with_stdio(false),cin.tie(NULL));
+
+ll fact(ll n){ if(n==0) return 1; ll res = 1; for (ll i = 2; i <= n; i++) res = res * i; return res;}
+ll nPr(ll n, ll r) { return fact(n) / fact(n - r); }
+ll nCr(ll n, ll r) { return fact(n) / (fact(r) * fact(n - r)); }
+ll gcd(ll a, ll b) { if (b == 0) return a; return gcd(b, a % b); }
+ll lcm(ll a, ll b) { return (a * b) / gcd(a, b);}
+ll mypow(ll a, ll b){ ll ans = 1; while(b){ if (b&1) ans = (ans*a) ; b /= 2; a = (a*a); } return ans; }
+bool isPrime(ll n) { if(n <= 1) return false; for(ll i = 2; i <= sqrt(n); i++) if(n % i == 0) return false; return true;}
+
+#define PI          3.141592653589793238;
+#define INF         LONG_LONG_MAX;
+#define MOD         1e9+7;
+
+//////////////////////////////////Code Start/////////////////////////////////////
+
+void solve()
+{
+    int n,l;
+    cin>>n>>l;
+    vector<int>lamps(n);
+    fr(n)
+        cin>>lamps[i];
+    int mx=0;
+    sort(all(lamps));
+    fro(n)
+    {
+        int x=lamps[i]-lamps[i-1];
+        mx=max(x,mx);
+    }
+    cout<<showpoint<<fixed<<setprecision(10);
+    double dis=max(lamps[0]-0, l - lamps[n - 1]);
+    cout<<max(dis,(double)mx/2)<<nl;
+}
+ 
+int main()
+{
+    fast_io;
+    int TC = 1;
+    //cin >> TC;
+    while (TC--) solve();
+}