Submission #548187

#	Time	Username	Problem	Language	Result	Execution time	Memory
548187		MilosMilutinovic	Triple Jump (JOI19_jumps)	C++14	100 / 100	1369 ms	67052 KiB

jumps

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int N=500050;
const int M=2*N;
int n,q,a[N],mx1[M],mx2[M],lzy[M],root,tsz,ls[M],rs[M],ans[N];
vector<pair<int,int>> Qs[N];
void push(int c,int ss,int se){
	if(ss!=se){
		mx2[ls[c]]=max(mx2[ls[c]],mx1[ls[c]]+lzy[c]);
		mx2[rs[c]]=max(mx2[rs[c]],mx1[rs[c]]+lzy[c]);
		lzy[ls[c]]=max(lzy[ls[c]],lzy[c]);
		lzy[rs[c]]=max(lzy[rs[c]],lzy[c]);
	}
	lzy[c]=-1e9;
}
void Build(int&c,int ss,int se){
	c=++tsz,mx2[c]=lzy[c]=-1e9;
	if(ss==se){mx1[c]=a[ss];return;}
	int mid=ss+se>>1;
	Build(ls[c],ss,mid);
	Build(rs[c],mid+1,se);
	mx1[c]=max(mx1[ls[c]],mx1[rs[c]]);
}
void Set(int c,int ss,int se,int qs,int qe,int x){
	if(ss>se||ss>qe||se<qs)return;
	if(qs<=ss&&se<=qe){
		mx2[c]=max(mx2[c],mx1[c]+x);
		lzy[c]=max(lzy[c],x);
		push(c,ss,se);
		return;
	}
	push(c,ss,se);
	int mid=ss+se>>1;
	Set(ls[c],ss,mid,qs,qe,x);
	Set(rs[c],mid+1,se,qs,qe,x);
	mx2[c]=max(mx2[ls[c]],mx2[rs[c]]);
}
int Get(int c,int ss,int se,int qs,int qe){
	if(ss>se||ss>qe||se<qs)return -1e9;
	if(qs<=ss&&se<=qe)return mx2[c];
	push(c,ss,se);
	int mid=ss+se>>1;
	return max(Get(ls[c],ss,mid,qs,qe),Get(rs[c],mid+1,se,qs,qe));
}
void Add(int i,int j){Set(root,1,n,2*j-i,n,a[i]+a[j]);}
int main(){
	scanf("%i",&n);
	for(int i=1;i<=n;i++)scanf("%i",&a[i]);
	scanf("%i",&q);
	for(int i=1;i<=q;i++){
		int l,r;scanf("%i%i",&l,&r);
		Qs[l].pb({r,i});
	}
	Build(root,1,n);
	vector<int> stk;
	for(int i=n;i>=1;i--){
		while(!stk.empty()&&a[stk.back()]<=a[i])Add(i,stk.back()),stk.pop_back();
		if(!stk.empty())Add(i,stk.back());
		stk.pb(i);
		for(auto qs:Qs[i])ans[qs.second]=Get(root,1,n,i,qs.first);
	}
	for(int i=1;i<=q;i++)printf("%i\n",ans[i]);
	return 0;
}

Compilation message (stderr)

jumps.cpp: In function 'void Build(int&, int, int)':
jumps.cpp:20:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   20 |  int mid=ss+se>>1;
      |          ~~^~~
jumps.cpp: In function 'void Set(int, int, int, int, int, int)':
jumps.cpp:34:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |  int mid=ss+se>>1;
      |          ~~^~~
jumps.cpp: In function 'int Get(int, int, int, int, int)':
jumps.cpp:43:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   43 |  int mid=ss+se>>1;
      |          ~~^~~
jumps.cpp: In function 'int main()':
jumps.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |  scanf("%i",&n);
      |  ~~~~~^~~~~~~~~
jumps.cpp:49:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |  for(int i=1;i<=n;i++)scanf("%i",&a[i]);
      |                       ~~~~~^~~~~~~~~~~~
jumps.cpp:50:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |  scanf("%i",&q);
      |  ~~~~~^~~~~~~~~
jumps.cpp:52:16: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |   int l,r;scanf("%i%i",&l,&r);
      |           ~~~~~^~~~~~~~~~~~~~

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