Submission #1361913

#	Time	Username	Problem	Language	Result	Execution time	Memory
1361913		SriniV	Bosses (BOI16_bosses)	C++20	100 / 100	374 ms	732 KiB

bosses

#include <bits/stdc++.h>
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
//typedef __int128 lll;
#define PI 3.14159265358979323846
#define sbits(x) __builtin_popcountll(x)
#define tbits(total_size, num) ((total_size) - __builtin_clz(num))
#define pb push_back
#define f first
#define s second
#define clr(ds) ds.clear()
#define all(ds) ds.begin(), ds.end()
#define pi pair<ll, ll>
#define vi vector<int>
#define vll vector<ll>
#define vpi vector<pi>
#define sz(i) (int)i.size()
using namespace std;
int xP[] = {0,0,1,-1,1,1,-1,-1} , yP[] = {1,-1,0,0,1,-1,-1,1};
uint64_t time() {
  using namespace std::chrono;
  return duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
}
int rand(int a , int b){
	return a + rand()%(b-a+1);
}
void setIO(string name = "") {
	cin.tie(0)->sync_with_stdio(0);
	if (name.size()) {
		freopen((name + ".in").c_str(), "r", stdin);
		freopen((name + ".out").c_str(), "w", stdout);
	}
}
bool ckmin(auto& a , auto b){if(a<=b)return 0; else {a=b;return 1;}}
bool ckmax(auto& a , auto b){if(a>=b)return 0; else {a=b;return 1;}}
/*
 _______________________________________
( If you don't fail at least 90% of the )
( time, you're not aiming high enough.  )
(                                       )
( - Alan Kay                            )
 ---------------------------------------
        o   ^__^
         o  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||
*/
int n;
const int MAXN = 5000;
vi adj[MAXN];
void solve(){
	auto bfs = [&](int root) -> int{
		queue<int> q;
		q.push(root);
		vi dist(n , INT_MAX);
		dist[root] = 0;
		int ans = n;
		int cnt = 0;
		while(sz(q)){
			cnt ++ ;
			auto next = q.front();
			q.pop();
			ans += dist[next];
			for(auto& neigh : adj[next])if(dist[neigh] == INT_MAX)
				dist[neigh] = dist[next] + 1 , q.push(neigh);
		}
		return cnt == n?ans:INT_MAX;
	};
	cin >> n;
	for(int i = 0;i<n;i++){
		int num;
		cin >> num;
		for(int j = 0;j<num;j++){
			int v;
			cin >> v ,--v;
			adj[v].pb(i);
		}
	}
	int ans = INT_MAX;
	for(int i = 0;i<n;i++)ans = min(ans , bfs(i));
	cout << ans << "\n";
}

int main(){
	setIO();
	int t = 1;
//	cin >> t;
	while(t--){
		solve();
	}	
}

Compilation message (stderr)

bosses.cpp: In function 'void setIO(std::string)':
bosses.cpp:31:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |                 freopen((name + ".in").c_str(), "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:32:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |                 freopen((name + ".out").c_str(), "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33