Submission #397853

#	Time	Username	Problem	Language	Result	Execution time	Memory
397853		juggernaut	Bali Sculptures (APIO15_sculpture)	C++17	71 / 100	26 ms	336 KiB

sculpture

#include<bits/stdc++.h>
#define fr first
#define sc second
using namespace std;
void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
typedef long long ll;
#define USING_ORDERED_SET 0
#if USING_ORDERED_SET
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<class T>using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
#endif
template<class T>void umax(T &a,T b){if(a<b)a=b;}
template<class T>void umin(T &a,T b){if(b<a)a=b;}
#ifdef IOI2021SG
    #define printl(args...)printf(args)
#else
    #define printl(args...)((void)0)
#endif
int n,l,r,a[2005];
ll ans,pref[2005];
bool check(int a,int b){return(((a>>b)|ans)==ans);}
int main(){
    scanf("%d%d%d",&n,&l,&r);
    for(int i=0;i<n;i++)scanf("%d",&a[i]);
    if(n<=100){
        for(int bit=45;bit>=0;bit--){
            vector<bitset<2005>>dp(n+5);
            dp[0]=1;
            for(int j=1;j<=n;j++){
                ll sum=0;
                for(int k=j-1;k>=0;k--){
                    sum+=a[k];
                    if(((sum>>(bit+1))|ans)==ans&&!((sum>>bit)&1))dp[j]|=dp[k]<<1;
                }
            }
            bool flag=false;
            for(int i=l;i<=r;i++)flag|=dp[n][i];
            ans<<=1;
            ans|=(!flag);
        }
    }else{
        vector<ll>dp(n+5);
        for(int i=1;i<=n;i++)pref[i]=pref[i-1]+a[i-1];
        for(int bit=45;bit>=0;bit--){
			for(int i=1;i<=n;i++)dp[i]=9e18;
			for(int i=1;i<=n;i++){
				for(int j=0;j<i;j++)if(check(pref[i]-pref[j],bit+1))umin(dp[i],dp[j]+1);
			}
			ans<<=1;
			ans+=(dp[n]>r);
		}
    }
    printf("%lld",ans);
}

Compilation message (stderr)

sculpture.cpp: In function 'void usaco(std::string)':
sculpture.cpp:5:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sculpture.cpp:5:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
    5 | void usaco(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sculpture.cpp: In function 'int main()':
sculpture.cpp:24:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |     scanf("%d%d%d",&n,&l,&r);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
sculpture.cpp:25:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |     for(int i=0;i<n;i++)scanf("%d",&a[i]);
      |                         ~~~~~^~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 25 / 25
• Subtask 5: 0 / 29