Submission #229713

#	Time	Username	Problem	Language	Result	Execution time	Memory
229713		blacktulip	Mean (info1cup19_mean)	C++17	100 / 100	16 ms	1664 KiB

mean

#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;

#define fi first
#define int long long
#define se second
#define mp make_pair
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo MAX = -1000000000000000000;
const lo MIN = 1000000000000000000;
const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 405;
const lo mod = 1000000007;

int n,m,b[li],a[li],flag,t,PS[li],dp[li][li];
int cev;
string s;
vector<int> v;

inline int f(int l,int r){
	int cevv=0;
	//~ if(r-l<2)return 0;
	//~ cout<<l<<" : : "<<r<<endl;
	if(r-l==1)return (a[r]+a[l])/2;
	if(r-l==0)return a[r];
	if(~dp[l][r])return dp[l][r];
	//~ if(l==r-1)return 0;
	//~ cout<<l<<r<<endl;
	int cev1=0;
	int yess=1;
	for(int i=l;i<r;i++){
		cev1+=a[i];
		yess*=2;
	}
	for(int i=l+1;i<r;i++){
		cevv=max(cevv,(f(l,i)+(f(i+1,r)))/2);
		cevv=max(cevv,(f(l,i-1)+(f(i,r)))/2);
	}
	yess/=2;
	return dp[l][r]=(cevv);
}

main(void){
	memset(dp,-1,sizeof(dp));
	scanf("%lld",&n);
	FOR{
		scanf("%lld",&a[i]);
		PS[i]=PS[i-1]+a[i];
	}
	
	printf("%lld\n",f(1,n));
	return 0;
}

Compilation message (stderr)

mean.cpp:54:10: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(void){
          ^
mean.cpp: In function 'int main()':
mean.cpp:56:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld",&n);
  ~~~~~^~~~~~~~~~~
mean.cpp:58:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld",&a[i]);
   ~~~~~^~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 70 / 70