Submission #242312

#	Time	Username	Problem	Language	Result	Execution time	Memory
242312		jamielim	Triple Jump (JOI19_jumps)	C++14	19 / 100	1348 ms	75848 KiB

jumps

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<ll,ll> ii;
typedef long double ld;
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define ALL(x) x.begin(),x.end()
#define SZ(x) (int)x.size()
const int INF=2012345678;
const ll LLINF=4012345678012345678LL;
const ll MOD=1000000007; //998244353; //
const ld PI=3.1415926535898;
const ld EPS=1e-9;
ll gcd(ll a,ll b){if(a<b)swap(a,b);if(b==0)return a;return gcd(b,a%b);}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
inline ll expo(ll b,ll p,ll m){ll res=1; while(p){if(p&1)res=(res*b)%m; b=(b*b)%m; p>>=1;} return res;}
inline ll modinv(ll a,ll m){return expo(a,m-2,m);}

int n,q;
int arr[500005];
int dp[5005][5005];

struct node{
	int s,e,m,v;
	node *l,*r;
	node(int S,int E){
		s=S;e=E;m=(s+e)/2;
		if(s!=e){
			l=new node(s,m);r=new node(m+1,e);
			v=max(l->v,r->v);
		}else{
			v=arr[s];
		}
	}
	int rmq(int x,int y){
		if(s==x&&e==y)return v;
		if(y<=m)return l->rmq(x,y);
		if(x>m)return r->rmq(x,y);
		return max(l->rmq(x,m),r->rmq(m+1,y));
	}
}*root;

int main(){
	scanf("%d",&n);
	for(int i=0;i<n;i++)scanf("%d",&arr[i]);
	root=new node(0,5005);
	for(int i=0;i<n;i++){
		for(int j=i+2;j<n;j++){
			dp[i][j]=arr[i]+arr[j]+root->rmq(i+1,(i+j)/2);
			//printf("%d ",dp[i][j]);
		}
		//printf("\n");
	}
	for(int i=1;i<n;i++){
		for(int j=0;j<n-i;j++){
			dp[j][j+i]=max(dp[j][j+i],max(dp[j][j+i-1],dp[j+1][j+i]));
		}
	}
	
	scanf("%d",&q);
	int l,r;
	for(int i=0;i<q;i++){
		scanf("%d%d",&l,&r);l--;r--;
		printf("%d\n",dp[l][r]);
	}
}

Compilation message (stderr)

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]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
jumps.cpp:49:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=0;i<n;i++)scanf("%d",&arr[i]);
                      ~~~~~^~~~~~~~~~~~~~
jumps.cpp:64:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&q);
  ~~~~~^~~~~~~~~
jumps.cpp:67:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&l,&r);l--;r--;
   ~~~~~^~~~~~~~~~~~~~

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