Submission #742526

#	Time	Username	Problem	Language	Result	Execution time	Memory
742526		MODDI	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	297 ms	20808 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
typedef long long ll;
typedef pair<long long, long long> pll;
typedef pair<int,int> pii;
typedef vector<long long> vl;
typedef vector<int> vi;
int n;
ll m;
bool check_bit(int n, int bit){
	int ok = n & (1 << bit);
	if(ok)	return true;
	return false;
}
int main(){
	cin>>n>>m;
	vl arr(n+1);
	for(int i =1; i <= n; i++)	cin>>arr[i];
	vl msk1, msk2;
	int k = n / 2;
	for(int i = 0; i < (1 << k); i++){
		ll sum = 0;
		for(int j = 0; j < k; j++){
			if(check_bit(i, j))
				sum += arr[j+1];
		}
		msk1.pb(sum);
	}
	for(int i = 0; i < (1 << n - k); i++){
		ll sum = 0;
		for(int j = 0; j < n-k; j++){
			if(check_bit(i, j))
				sum += arr[j+k+1];
		}
		msk2.pb(sum);
	}
	sort(msk1.begin(), msk1.end());
	sort(msk2.begin(), msk2.end());
	int j = 0;
	ll ans = 0;
	for(int i = msk1.size()-1; i >= 0; i--){
		while(j < msk2.size() && msk2[j] + msk1[i] <= m)	j++;
		ans += j;
	}
	cout<<ans<<endl;
	return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:31:29: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   31 |  for(int i = 0; i < (1 << n - k); i++){
      |                           ~~^~~
bobek.cpp:44:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |   while(j < msk2.size() && msk2[j] + msk1[i] <= m) j++;
      |         ~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10