Submission #566335

#	Time	Username	Problem	Language	Result	Execution time	Memory
566335		Abdulmohsen1284	Bootfall (IZhO17_bootfall)	C++14	6 / 100	416 ms	262144 KiB

bootfall

#include"bits/stdc++.h"
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class x>
using ordered_set = tree<x, null_type,less<x>, rb_tree_tag,tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
bool plc[20000];
long long occ[20000],a[505];
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    long long n,sum=0;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        cin>>a[i];
        sum+=a[i];
    }
    plc[0]=true;
    vector <int> h;
    vector <int> yes;
    yes.push_back(0);
    for(int i=0;i<n;i++)
    {
        for(int j=yes.size()-1;j>=0;j--)
        {
            if(plc[yes[j]+a[i]]!=true||(yes[j]+a[i])<=20000){
                plc[yes[j]+a[i]]=true;
                yes.push_back(yes[j]+a[i]);
            }
        }
    }
    //cout<<"HI"<<endl;
    if(plc[sum/2]&&sum%2==0)
    {
        for(int k=0;k<n;k++)
        {
            sum-=a[k];
            for(int i=0;i<=20000;i++)
                plc[i]=false;
            plc[0]=true;
            yes.clear();
            yes.push_back(0);
            for(int i=0;i<n;i++)
            {
                if(i==k)
                    continue;
                for(int j=yes.size()-1;j>=0;j--)
                {
                    if(plc[yes[j]+a[i]]!=true||(yes[j]+a[i])<=20000){
                        plc[yes[j]+a[i]]=true;
                        yes.push_back(yes[j]+a[i]);
                    }
                }
            }
            //cout<<"HELLO"<<endl;
            for(int i=0;i<=sum;i++)
            {
                long long oth=i-(sum-i);
                if(oth<=0||oth>=20000)
                    continue;
                if(plc[i]){
                    occ[oth]++;
                    //cout<<oth<<" ";
                }
            }
            //cout<<endl;
            sum+=a[k];
        }
        
    }
    for(int i=1;i<=20000;i++)
        {
 
                if(occ[i]==n){
                    //cout<<"???"<<endl;
                    h.push_back(i);
        }
    }
    cout<<h.size()<<"\n";
    for(auto i : h)
        cout<<i<<" ";
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:43:23: warning: iteration 20000 invokes undefined behavior [-Waggressive-loop-optimizations]
   43 |                 plc[i]=false;
      |                 ~~~~~~^~~~~~
bootfall.cpp:42:26: note: within this loop
   42 |             for(int i=0;i<=20000;i++)
      |                         ~^~~~~~~
bootfall.cpp:43:23: warning: 'void* __builtin_memset(void*, int, long unsigned int)' forming offset 20000 is out of the bounds [0, 20000] of object 'plc' with type 'bool [20000]' [-Warray-bounds]
   43 |                 plc[i]=false;
      |                 ~~~~~~^~~~~~
bootfall.cpp:9:6: note: 'plc' declared here
    9 | bool plc[20000];
      |      ^~~

• Subtask 1: 6 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35