Submission #150948

#	Time	Username	Problem	Language	Result	Execution time	Memory
150948		username	Triple Jump (JOI19_jumps)	C++14	27 / 100	226 ms	17636 KiB

jumps

#pragma GCC optimize("O3")
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#include<ext/rope>
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define VIS(it,con) for(auto it=con.begin();it!=con.end();++it)
#define pob pop_back
#define pf push_front
#define pof pop_front
#define MIN(x,y) (x=min(x,(y)))
#define MAX(x,y) (x=max(x,(y)))
#define mid (l+r>>1)
#define lch (idx*2+1)
#define rch (idx*2+2)
/*****************************************************************************/
#include<bits/stdc++.h>
//#define int int_fast64_t
using namespace std;
typedef pair<int,int> pii;
#define REP(i,j,k) for(register int i=(j);i<(k);++i)
#define RREP(i,j,k) for(register int i=int(j)-1;i>=(k);--i)
#define ALL(a) a.begin(),a.end()
#define pb push_back
#define f first
#define s second
#define endl '\n'
																#define __debug
#ifdef __debug
	#define IOS (void)0
	#define de(...) cerr<<__VA_ARGS__
	#define ar(a,s,t) {REP(__i,s,t)de(a[__i]<<' ');de(endl);}
#else
	#define IOS cin.tie(0),cout.tie(0),ios_base::sync_with_stdio(false)
	#define de(...) (void)0
	#define ar(...) (void)0
#endif
/***********************************default***********************************/
const int maxn=5e5+9,lg=19,inf=1e9;
int n,q,res=0,a[maxn],b[maxn],sp[lg][maxn];

int qr(int l,int r){
	if(l==r)return -inf;
	int k=__lg(r-l);
	return max(sp[k][l],sp[k][r-(1<<k)]);
}

main(){
	IOS;
	cin>>n;
	REP(i,0,n)cin>>a[i],b[i]=i,sp[0][i]=a[i];
	cin>>q;
	sort(b,b+n,[](int x,int y){return a[x]>a[y];});
	REP(i,1,lg)REP(j,0,n)if(j+(1<<i-1)<n)sp[i][j]=max(sp[i-1][j],sp[i-1][j+(1<<i-1)]);
	REP(_,0,min(n,lg)){
		REP(j,0,n){
			int p=b[_],q=j;
			if(p==q)continue;
			if(p>q)swap(p,q);
			MAX(res,a[p]+a[q]+max({qr(max(0,2*p-q),p),qr(p+1,(p+q+1)/2),qr(min(n,2*q-p),n)}));
		}
	}
	cout<<res<<endl;
}

Compilation message (stderr)

jumps.cpp:48:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
jumps.cpp: In function 'int main()':
jumps.cpp:54:33: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
  REP(i,1,lg)REP(j,0,n)if(j+(1<<i-1)<n)sp[i][j]=max(sp[i-1][j],sp[i-1][j+(1<<i-1)]);
                                ~^~
jumps.cpp:54:78: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
  REP(i,1,lg)REP(j,0,n)if(j+(1<<i-1)<n)sp[i][j]=max(sp[i-1][j],sp[i-1][j+(1<<i-1)]);
                                                                             ~^~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 27 / 27
• Subtask 4: 0 / 54