Submission #555384

#	Time	Username	Problem	Language	Result	Execution time	Memory
555384		LucaDantas	Group Photo (JOI21_ho_t3)	C++17	5 / 100	3 ms	340 KiB

Main

#include <bits/stdc++.h>
using namespace std;
 
constexpr int maxn = 11;
 
int a[maxn], b[maxn];
bool mark[maxn];

bool valid(int n) {
	for(int i = 1; i < n; i++)
		if(b[i] + 2 <= b[i-1])
			return 0;
	return 1;
}

int get(int n) {
	memset(mark, 1, sizeof mark);
	int ans = 0;
	for(int i = 0; i < n; i++) {
		for(int j = 0; a[j] != b[i]; j++)
			ans += mark[a[j]];
		mark[b[i]] = 0;
	}
	return ans;
}
 
int main() {
	int n; scanf("%d", &n);
	for(int i = 0; i < n; i++)
		scanf("%d", &a[i]);
	iota(b, b+n, 1);
	int ans = 0x3f3f3f3f;
	do {
		if(valid(n))
			ans = min(ans, get(n));
	} while(next_permutation(b, b+n));
	printf("%d\n", ans);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |  int n; scanf("%d", &n);
      |         ~~~~~^~~~~~~~~~
Main.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

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