Submission #420514

#	Time	Username	Problem	Language	Result	Execution time	Memory
420514		JvThunder	Cigle (COI21_cigle)	C++14	0 / 100	1 ms	204 KiB

cigle

#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define fir first
#define sec second
typedef long long ll;

using namespace std;

int n;
vector<int> v;

void solve()
{
    cin >> n;
    for(int i=0;i<n;i++)
    {
        int tmp;
        cin >> tmp;
        v.pb(tmp);
    }

    int mxcnt = 0;
    for(int mask=0;mask<(1<<n);mask++)
    {
        int cnt = 0;
        set<int> prv;
        set<int> curr;
        int pos = 0;
        int layer = 0;

        bool impos;
        for(int j=1;j<n;j++)
        {
            int x1,x2;
            if((1<<j)&mask) x1 = 1; 
            if((1<<j-1)&mask) x2 = 1;
            if(x1==x2 && x2==1) impos = true;
        }
        if(impos) break;

        for(int j=0;j<n;j++)
        {
            if((1<<j)&mask)
            {
                layer++;
                prv.clear();
                prv = curr;
                curr.clear();
            }
            int sign = 1;
            if(layer%2) sign *= -1;
            pos += sign*v[j];
            if(prv.find(pos)!=prv.end() && ((1<<j+1)&mask)==0 && j!=n-1) cnt++;
            curr.insert(pos);
        }
        mxcnt = max(mxcnt,cnt);
    }
    cout << mxcnt << endl;
	return;
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int tc=1;
	//cin>>tc;
	for(int i=1;i<=tc;i++) solve();
 	return 0;
}

Compilation message (stderr)

cigle.cpp: In function 'void solve()':
cigle.cpp:37:21: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   37 |             if((1<<j-1)&mask) x2 = 1;
      |                    ~^~
cigle.cpp:54:50: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   54 |             if(prv.find(pos)!=prv.end() && ((1<<j+1)&mask)==0 && j!=n-1) cnt++;
      |                                                 ~^~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 11
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 52