Submission #946218

#	Time	Username	Problem	Language	Result	Execution time	Memory
946218		veljko	Bosses (BOI16_bosses)	C++17	0 / 100	1527 ms	240080 KiB

bosses

/*****from dust I have come, dust I will be*****/
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
 
using namespace __gnu_pbds;
using namespace std;
#define int long long
#define forn(i,n) for(int i=0;i<n;i++)
int dx[8] = { 1, 0, -1, 0, -1, 1, -1, 1 };
int dy[8] = { 0, 1, 0, -1, -1, 1, 1, -1 };
int ceil_div(int a, int b) {return a % b == 0 ? a / b : a / b + 1;}
 
const int MOD = 1000000007;
//const int MOD = 998244353;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds; // find_by_order, order_of_key
 
/*
int k = A.order_of_key(p[i].second);
A.erase(A.find_by_order(k));
erase element from pbds multiset
*/

int bfs(vector<vector<int>>&g, int start, int n){
    vector<int>vis(n, 0);
    queue<int>q;
    q.push(start);
    vis[start] = 1;
    int cost = 0, cnt = 0;
    while (!q.empty()){
        auto t = q.front();
        q.pop();
        for (auto x : g[t]){
            if (vis[x] == 0){
                cnt++;
                vis[x] = vis[t] + 1;
                cost += vis[x];
                q.push(x);
            }
        }
    }
    if (cnt != n-1) return 1e18;
    return cost + 1;
}
 
void solve(){
    int n; cin >> n;
    vector<vector<int>>g(n);
    forn(i,n){
        int sz; cin >> sz;
        int x;
        forn(j,sz){
            cin >> x;
            g[x-1].push_back(i);
        }
    }
    int ans = 1e18;
    forn(i,n){
        ans = min(ans, bfs(g,i,n));
    }
    cout <<ans<<'\n';
    
}
 
 
int32_t main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
 
    int t = 1; //cin >>t;
    for (int i=1;i<=t;i++){
        solve();
    }
    return 0;
}

Compilation message (stderr)

bosses.cpp: In function 'int32_t main()':
bosses.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33