Submission #803051

#	Time	Username	Problem	Language	Result	Execution time	Memory
803051		YassineBenYounes	Political Development (BOI17_politicaldevelopment)	C++17	100 / 100	838 ms	307732 KiB

politicaldevelopment

#include<bits/stdc++.h>
typedef long long ll;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<pair<ll, ll>, null_type, less<pair<ll,ll>>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
////////////////////Only Clear Code//////////////////////////
void usaco_problem(){
    freopen("milkvisits.in", "r", stdin);
    freopen("milkvisits.out", "w", stdout);
}
 
void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}
 
const int mx = 5e4+5;
const int mxnd = mx*33;
const int LOG = 25;
const ll inf = 1e18;
const ll mod = 1e8;
 
vector<int> graph[mx];
 
int ans = 0;
 
vector<int> cur;
bool done[mx];
int n;

bitset<50000> bg[mx];

void solve(int k, bitset<50000> bs){
    ans = max(ans, k);
    if(k == 0){
        for(int i = 0; i < n;i++){ 
            cur.push_back(i);
            done[i] = 1;
            solve(k+1, bg[i]);
            done[i] = 0;
            cur.pop_back();
        }
        return;
    }
	bitset<50000> now = bs;
    while(now != 0){
		long unsigned int to = now._Find_first();
        now[to] = 0;
		solve(k+1, now & bg[to]);
		if(ans == 10) return;
	}
    /*
    for(int adj : graph[cur[0]]){
        if(done[adj])continue;
        bool take = 1;
        for(int x : cur){
            if(mp[x][adj] == 0)take = 0;
        }
        if(take){
            cur.push_back(adj);
            done[adj] = 1;
            solve(k+1);
            done[adj] = 0;
            cur.pop_back();
        }
    }*/
}
 
void run_case(){
    int k;cin >> n >> k;
    for(int i = 0; i < n;i++){
        int c;cin >> c;
        while(c--){
            int x;cin >> x;
            //graph[i].push_back(x);
            bg[i][x] = 1;
        }
    }
    ans = 0;
    solve(0,0);
    cout << ans << endl;
}
 
int main(){
    speed;
    int t = 1;
    //cin >> t;
    while(t--){
        run_case();
    }
}
 
/*
    NEVER GIVE UP!
    DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
    Your Guide when stuck:
    - Continue keyword only after reading the whole input
    - Don't use memset with testcases
    - Check for corner cases(n=1, n=0)
    - Check where you declare n(Be careful of declaring it globally and in main)
*/

Compilation message (stderr)

politicaldevelopment.cpp: In function 'void usaco_problem()':
politicaldevelopment.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen("milkvisits.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen("milkvisits.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
politicaldevelopment.cpp: In function 'void init()':
politicaldevelopment.cpp:20:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
politicaldevelopment.cpp:22:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 38 / 38
• Subtask 5: 23 / 23