Submission #867745

#	Time	Username	Problem	Language	Result	Execution time	Memory
867745		goodspeed0208	Group Photo (JOI21_ho_t3)	C++14	12 / 100	1866 ms	123556 KiB

Main

#include<iostream>
#include<vector>
#include<algorithm>
#define INF 1000000000
using namespace std;

int main() {
	int n;
	cin >> n;
	vector<int>v(n);
	for (auto &i : v) cin >> i;
	vector<vector<int> >dp((1 << n), vector<int>(n, INF));
	vector<int>back(n, 0);
	for (int i = n-2 ; i >= 0 ; i--) {
		back[i] = back[i+1] | (1 << (i+1));
		//cout << back[i] << " ";
	}
	//cout << "\n";
	int cost = 1;
	for (int i = 0 ; i < n ; i++) dp[1 << i][i] = i;
	for (int i = 1 ; i < (1 << n) ; i++) {
		int t = __builtin_popcount(i);
		for (int j = 0 ; j < n ; j++) {
			for (int k = 0 ; k < n ; k++) {
				if ( ((i >> k) & 1)==0 && (v[j] < v[k] + 2) ) {
					int cost = k - t + __builtin_popcount(i & back[k]);
					//cout << k << " " << t << " " << __builtin_popcount(i & back[k]) << "\n";
					dp[i | (1 << k) ][k] = min(dp[i | (1 << k)][k], dp[i][j] + cost);
				}
			} 
		}
	}
	/*for (int j = 0 ; j < n ; j++) {
		for (int i = 0 ; i < n ; i++) {
			cout << dp[(1 << n) - 1][i] << endl;
		}
	}*/
	cout << *min_element(dp[(1 << n) - 1].begin(), dp[(1 << n) - 1].end()) << "\n";
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:19:6: warning: unused variable 'cost' [-Wunused-variable]
   19 |  int cost = 1;
      |      ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 0 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36