Submission #338408

#	Time	Username	Problem	Language	Result	Execution time	Memory
338408		tengiz05	Biochips (IZhO12_biochips)	C++17	0 / 100	1 ms	492 KiB

biochips

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL);
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define pii pair<int, int>
#define ff first
#define ss second
#define PI acos(-1)
#define ld long double
template<class T> bool ckmin(T& a, const T& b) {return a>b? a=b, true:false;}
template<class T> bool ckmax(T& a, const T& b) {return a<b? a=b, true:false;}
const int mod = 1e9+7, N = 2e5+5;
int msb(int val){return sizeof(int)*8-__builtin_clzll(val)-1;}
int a[N], n, m, k;
int p[N];
void solve(int test_case){
	int i, j;
	cin >> n >> k;
	for(i=1;i<=n;i++){
		cin >> p[i] >> a[i];
	}
	int ans = -1;
	for(int mask = 1; mask < (1<<n); mask++){
		if(__builtin_popcount(mask) != k)continue;
		vector<int> v;
		for(i=0;i<n;i++){
			if(mask & (1<<i))v.pb(i+1);
		}
		vector<int> used(n+1);
		for(auto x : v)used[x] = 1;
		bool is = true;
		int sum = 0;
		for(auto x : v){
			sum += a[x];
			if(used[x] == 2)is = false;
			while(p[x] != 0){
				x = p[x];
				if(used[x] == 1)is = false;
				used[x] = 2;
			}
		}
		if(is)ckmax(ans,sum);
	}assert(~ans);
	cout << ans << '\n';
	return;
}

signed main(){
	FASTIO;
#define MULTITEST 0
#if MULTITEST
	int _T;
	cin >> _T;
	for(int T_CASE = 1; T_CASE <= _T; T_CASE++)
		solve(T_CASE);
#else
	solve(1);
#endif
	return 0;
}

Compilation message (stderr)

biochips.cpp: In function 'void solve(long long int)':
biochips.cpp:19:9: warning: unused variable 'j' [-Wunused-variable]
   19 |  int i, j;
      |         ^

• Subtask 1: 0 / 100