Submission #296305

#	Time	Username	Problem	Language	Result	Execution time	Memory
296305		arayi	Friend (IOI14_friend)	C++17	11 / 100	1092 ms	5088 KiB

friend

#include <bits/stdc++.h>
#include "friend.h"
#define ad push_back
using namespace std;

const int N = 1010;
vector <int> g[N];
bool col[20][20];
int findSample(int n,int c[],int host[],int pr[])
{
    bool mk, erk, erq;
    mk=erk=erq=0;
	for (int i = 1; i < n; i++)
	{
	    if(pr[i] == 0)
        {
            g[host[i]].ad(i);
            g[i].ad(host[i]);
            mk = 1;
        }
        else if(pr[i] == 1)
        {
            for(auto p : g[host[i]]) g[p].ad(i), g[i].ad(p);
            erk = 1;
        }
        else
        {
            for(auto p : g[host[i]]) g[p].ad(i), g[i].ad(p);
            g[host[i]].ad(i);
            g[i].ad(host[i]);
            erq = 1;
        }
	}
	if(n <= 10)
    {
        for (int i = 0; i < n; i++)
            for(auto p : g[i]) col[i][p] = 1;//, cout << i << " " << p << endl;
        int pat = 0;
        for(int x = 0; x < (1 << n); ++x)
        {
            int sum = 0;
            vector <int> sm;
            for (int i = 0; i < n; i++)
                if(x & (1 << i)) sum += c[i], sm.ad(i);
            bool bl = 0;
            for(auto p : sm)
                for(auto p1 : sm) if(col[p][p1]) bl = true;
            if(!bl) pat = max(pat, sum);
        }
        return pat;
    }
}

Compilation message (stderr)

friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:11:10: warning: variable 'mk' set but not used [-Wunused-but-set-variable]
   11 |     bool mk, erk, erq;
      |          ^~
friend.cpp:52:1: warning: control reaches end of non-void function [-Wreturn-type]
   52 | }
      | ^

• Subtask 1: 11 / 11
• Subtask 2: 0 / 8
• Subtask 3: 0 / 8
• Subtask 4: 0 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31