Submission #161887

#	Time	Username	Problem	Language	Result	Execution time	Memory
161887		MvC	Bigger segments (IZhO19_segments)	C++11	27 / 100	1572 ms	72036 KiB

segments

#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
using namespace std;
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=3e3+50;
const int mod=1e9+7;
int n,i,nr,st,j,t;
ll l,sm,a[nmax],f[nmax][nmax],pr[nmax];
/*void rec(int l,int r,int opl,int opr)
{
	if(l>r)return;
	int mid=(l+r)/2,bst;
	for(int i=opl-1;i<min(opr,mid);i++)
	{
		if(f[k-1][i]<=pr[mid]-pr[i]<=f[k][mid])
		{
			f[k][mid]=f[k-1][i]+pr[mid]-pr[i];
			bst=i;
		}
	}
	rec(l,mid-1,opl,bst);
	rec(mid+1,r,bst,opr);
}*/
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>n;
	for(i=1;i<=n;i++)
	{
		cin>>a[i];
		pr[i]=pr[i-1]+a[i];
	}
	for(i=0;i<=n;i++)for(j=0;j<=n;j++)f[i][j]=llinf;
	f[0][0]=0;
	for(i=1;i<=n;i++)
	{
		for(j=i;j<=n;j++)
		{
			for(t=j-1;t>=0;t--)
			{
				if(f[i-1][t]<=pr[j]-pr[t])
				{
					f[i][j]=pr[j]-pr[t];
					break;
				}
			}
		}
		if(f[i][n]<llinf)nr=max(nr,i);
	}
	/*for(i=0;i<=n;i++)for(j=1;j<=n;j++)f[i][j]=llinf;
	for(i=1;i<=n;i++)
	{
		k++;
		rec(1,n,1,n);
		if(f[k][n]!=llinf)
	}*/
	cout<<nr<<endl;
	return 0;
}

Compilation message (stderr)

segments.cpp:2:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("O3")
 
segments.cpp:3:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 #pragma GCC optimization("unroll-loops")

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27