Submission #1254690

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254690		_rain_	Olympiads (BOI19_olympiads)	C++20	44 / 100	2107 ms	325808 KiB

olympiads

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;

#define FOR(i,a,b) for(int i = (a) , _b = (b); i <= _b; ++i)
#define sz(x) (int)(x).size()
#define BIT(mask , x) (((mask)>>(x))&(1))
#define MASK(x) ((LL)(1)<<(x))

template<class X,class Y>
	bool maximize(X &x, Y y){
		if (x<y) return x = y , true; else return false;
	}
template<class X,class Y>	
	bool minimize(X &x, Y y){
		if (x>y) return x = y , true; else return false;
	}
	
const int N = (int)500;	
const LL inf = (LL)1e18;
map<vector<int>,bool> mp;
	int n , k , need_pos;
	int a[N + 2][N + 2] = {};
	
LL C(int x,int y){
		LL r1 = 1 , r2 = 1;
		if (x>y) return 0;
		FOR(i,y-x+1,y) r1 = r1 * i;
		FOR(i,1,x) r2 = r2 * i;
		return r1 / r2;
	}
	
namespace subtask2{
	bool check(){
		return n <= 40;
	}
	
	int cur[8] = {};
	
	int calc(){
		int sum = 0;
		for(int j = 0; j < k; ++j) {
			int mx = 0;
			for(int i = 0; i < k; ++i) {
				maximize(mx , a[cur[i]][j]);
			}
			sum += mx;
		}
		return sum;
	}
	vector<int>v;
	
	void recur(int id, int last = 0 ){
		if (id == k) {
//			cout<<1<<'\n';
//			for(int i = 0; i < k; ++i) cout<<cur[i]<<' '; cout<<'\n';
			v.push_back(calc());
			return;
		}
		if (last + 1 > n) return;
		for(int i = last + 1; i <= n; ++i){
			cur[id] = i;
			recur(id + 1 , i);
		}
	}
	
	void main_code(){
		recur(0,0);
		sort(v.begin() , v.end() , greater<int>());
		cout<<v[need_pos-1];
	}
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0) ; cout.tie(0);
	#define name "main"
	if (fopen(name".inp","r")){
		freopen(name".inp","r",stdin);
		freopen(name".out","w",stdout);
	}
	
	cin >> n >> k >> need_pos;

	FOR(i,1,n){
		for(int j = 0; j < k; ++j) cin >> a[i][j];
	}
//	cout << need_pos << '\n';
	return subtask2::main_code() , 0;	
}

Compilation message (stderr)

olympiads.cpp: In function 'int main()':
olympiads.cpp:79:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |                 freopen(name".inp","r",stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
olympiads.cpp:80:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |                 freopen(name".out","w",stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 31 / 31
• Subtask 3: 0 / 24
• Subtask 4: 0 / 32