CodeForces 679B Bear and Tower of Cubes

$dfs$，贪心。

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<iostream>
using namespace std;
typedef long long LL;
const double pi=acos(-1.0),eps=1e-6;
void File()
{
    freopen("D:\in.txt","r",stdin);
    freopen("D:\out.txt","w",stdout);
}
template <class T>
inline void read(T &x)
{
    char c=getchar(); x=0;
    while(!isdigit(c)) c=getchar();
    while(isdigit(c)) {x=x*10+c-'0'; c=getchar();}
}

LL n,ans2;
int ans1;

void dfs(LL x,int a1,LL a2)
{

    if(a1>ans1) ans1=a1,ans2=a2;
    else if(a2==ans1) ans2=max(ans2,a2);

    if(x==0) return;

    LL L=1,R=100000,pos;
    while(L<=R)
    {
        LL mid=(L+R)/2;
        if(mid*mid*mid<=x) pos=mid,L=mid+1;
        else R=mid-1;
    }

    dfs(x-pos*pos*pos,a1+1,a2+pos*pos*pos);
    if(pos*pos*pos-1-(pos-1)*(pos-1)*(pos-1)>=0)
        dfs(pos*pos*pos-1-(pos-1)*(pos-1)*(pos-1),a1+1,a2+(pos-1)*(pos-1)*(pos-1));
}

int main()
{
    scanf("%lld",&n);
    dfs(n,0,0);
    printf("%d %lld
",ans1,ans2);
    return 0;
}