Submission #799453

#TimeUsernameProblemLanguageResultExecution timeMemory
799453bachhoangxuanSparklers (JOI17_sparklers)C++17
0 / 100
1 ms340 KiB
// Judges with GCC >= 12 only needs Ofast // #pragma GCC optimize("O3,no-stack-protector,fast-math,unroll-loops,tree-vectorize") // MLE optimization // #pragma GCC optimize("conserve-stack") // Old judges // #pragma GCC target("sse4.2,popcnt,lzcnt,abm,mmx,fma,bmi,bmi2") // New judges. Test with assert(__builtin_cpu_supports("avx2")); // #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma,tune=native") // Atcoder // #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma") /* #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace __gnu_pbds; typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set; - insert(x),erase(x) - find_by_order(k): return iterator to the k-th smallest element - order_of_key(x): the number of elements that are strictly smaller */ #include<bits/stdc++.h> using namespace std; mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); uniform_real_distribution<> pp(0.0,1.0); #define int long long #define ld long double #define pii pair<int,int> #define piii pair<int,pii> #define mpp make_pair #define fi first #define se second const int inf=1e18; const int mod=998244353; const int maxn=200005; const int bl=650; const int maxs=655; const int maxm=200005; const int maxq=500005; const int maxl=20; const int maxa=250000; const int root=3; int power(int a,int n){ int res=1; while(n){ if(n&1) res=res*a%mod; a=a*a%mod;n>>=1; } return res; } const int iroot=power(3,mod-2); const int base=101; void solve(){ int n,k,t;cin >> n >> k >> t; vector<int> x(n+1); for(int i=1;i<=n;i++) cin >> x[i]; auto f = [&](vector<int> a,vector<int> b){ if(a[0]<b[0]) return false; int i=1,j=1,mn=b[0],mx=a[0]; while(true){ if(i<(int)a.size() && a[i]>=mn) mx=max(mx,a[i++]); else if(j<(int)b.size() && b[j]<=mx) mn=min(mn,b[j++]); else break; } return (i==(int)a.size() && j==(int)b.size()); }; auto check = [&](int m){ vector<int> a,b; for(int i=k;i>=1;i--) a.push_back(x[i]-2*m*t*i); for(int i=k;i<=n;i++) b.push_back(x[i]-2*m*t*i); if(f(a,b)) return true; reverse(a.begin(),a.end()); reverse(b.begin(),b.end()); return f(a,b); }; int l=0,r=2e9/t,res=1e9; while(r>=l){ int mid=(l+r)>>1; if(check(mid)) res=mid,r=mid-1; else l=mid+1; } cout << res << '\n'; } signed main(){ ios_base::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL); int test=1;//cin >> test; while(test--) solve(); }
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