Submission #636955

#	Time	Username	Problem	Language	Result	Execution time	Memory
636955		BidoTeima	Bosses (BOI16_bosses)	C++17	0 / 100	2 ms	724 KiB

bosses

/// isA AC
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<typename t1>
using ordered_set = tree<t1, null_type,less<t1>, rb_tree_tag,tree_order_statistics_node_update>;
using ll = long long;
void moo(string filename);
void ACPLS(string str = "")
{
    if(str=="NOF")return;
    if(str.size())
        moo(str);
    else{
        #ifndef ONLINE_JUDGE
            freopen("output.txt", "w", stdout);
            freopen("input.txt", "r", stdin);
        #endif
    }
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
void moo(string fileName){
    freopen((fileName+".in").c_str(),"r",stdin);
    freopen((fileName+".out").c_str(),"w",stdout);
}
#define tc         \
    int tttttt,subtask;    \
    cin >> tttttt /*>> subtask*/; \
    while (tttttt--)
#define sumrange(l, r, arr) (l == 0 ? arr[r] : arr[r] - arr[l - 1])
#define all(v) v.begin(), v.end()
vector<int>canBeChildren[5005];
vector<int>adj[5005];
vector<int>adj_rev[5005];
vector<bool>vis(5005);
ll salary[5005];
vector<int>topo;
void dfs(int node){
    for(int possibleChild : canBeChildren[node]){
        if(!vis[possibleChild]){
            vis[possibleChild] = 1;
            adj[node].push_back(possibleChild);
            adj_rev[possibleChild].push_back(node);
            dfs(possibleChild);
        }
    }
    topo.push_back(node);
}
void dfs_rev(int node){
    for(int parent : adj_rev[node]){
        salary[parent] += salary[node];
    }
}
int main()
{
    ACPLS(""); 
    int n;
    cin>>n;
    for(int i = 1; i <= n; i++){
        int k;
        cin>>k;
        for(int j = 0; j < k; j++){
            int parent;
            cin>>parent;
            canBeChildren[parent].push_back(i);
        }
    }
    ll ans = LLONG_MAX;
    int root = -1;
    for(int i = 1; i <= n; i++){ 
        for(int j = 1; j <= 5000; j++){
            adj[j].clear();
            adj_rev[j].clear();
            vis[j] = 0;
            salary[j] = 1;
        }
        topo.clear();
        vis[i] = 1;
        dfs(i);
        bool ok = 1;
        for(int j = 1; j <= n; j++){
            if(!vis[j]){
                ok = 0;
                break;
            }
        }
        if(!ok)continue;
        for(int node : topo){
            dfs_rev(node);
        }
        ll res = 0;
        for(int j = 1; j <= n; j++){
            res+=salary[j];
        }
        if(res<ans){
            ans = res;
            root = i;
        }
    }
    cout<<ans;
}   

Compilation message (stderr)

bosses.cpp: In function 'int main()':
bosses.cpp:73:9: warning: variable 'root' set but not used [-Wunused-but-set-variable]
   73 |     int root = -1;
      |         ^~~~
bosses.cpp: In function 'void ACPLS(std::string)':
bosses.cpp:18:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |             freopen("output.txt", "w", stdout);
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:19:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |             freopen("input.txt", "r", stdin);
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp: In function 'void moo(std::string)':
bosses.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((fileName+".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     freopen((fileName+".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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