Submission #864533

#	Time	Username	Problem	Language	Result	Execution time	Memory
864533		iskhakkutbilim	Political Development (BOI17_politicaldevelopment)	C++17	39 / 100	3095 ms	314280 KiB

politicaldevelopment

#include <bits/stdc++.h>
using namespace std;
 
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
const int N = 50000;
int n, k;
int deg[N];
vector<int> g[N];
bitset<N> yes[N];
 
bool can(vector<int>&v){
	for(int i = 0;i < v.size(); i++){
		for(int j = i +1;j < v.size(); j++){
			if(yes[v[i]][v[j]] == 0) return false;
		}
	}
	return true;
}
 
 
main(){
   ios::sync_with_stdio(0);
   cin.tie(0); cout.tie(0);
	cin >> n >> k;
	for(int i = 0;i < n; i++){
		int sz; cin >> sz;
		deg[i] = sz;
		for(int j = 0;j < sz; j++){
			int x; cin >> x;
			yes[i][x] = 1;
//			if(i < x) 
			g[i].push_back(x);
		}
	}	
	int ans = 1;
	for(int mask = 0; mask < (1<<k); mask++){
		for(int i = 0;i < n; i++){
//			if(deg[i] < __builtin_popcount(mask)) continue;
			vector<int> v;
			for(int j = 0;j < g[i].size(); j++){
				if(mask & (1<<j)){
					v.push_back(g[i][j]);
				}
			}
			if(can(v)){
				ans = max(ans, (int)v.size() + 1);
			}
		}
	}
	cout << ans;
	return 0;
}

Compilation message (stderr)

politicaldevelopment.cpp: In function 'bool can(std::vector<int>&)':
politicaldevelopment.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |  for(int i = 0;i < v.size(); i++){
      |                ~~^~~~~~~~~~
politicaldevelopment.cpp:15:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |   for(int j = i +1;j < v.size(); j++){
      |                    ~~^~~~~~~~~~
politicaldevelopment.cpp: At global scope:
politicaldevelopment.cpp:23:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   23 | main(){
      | ^~~~
politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:42:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |    for(int j = 0;j < g[i].size(); j++){
      |                  ~~^~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 23
• Subtask 4: 0 / 38
• Subtask 5: 23 / 23