Submission #36181

#	Time	Username	Problem	Language	Result	Execution time	Memory
36181		ToMoClone	Bootfall (IZhO17_bootfall)	C++14	100 / 100	679 ms	6976 KiB

bootfall

/*input
4
1 3 1 5
*/
#include <stdio.h>
#include <vector>
using namespace std;

const int N = 501;
int check[N * N], cnt[250001], num[1000001], a[N], n, sum, ans;

int main(){
	scanf("%d", &n);

	check[0] = 1;
	for(int i = 1; i <= n; ++i){
		scanf("%d", &a[i]), sum += a[i];
		for(int j = sum; j >= a[i]; --j)
			check[j] += check[j - a[i]];
	}
	if((sum & 1) || check[sum >> 1] == 0) return puts("0"), 0;

	for(int i = 1; i <= n; ++i){
		for(int j = 0; j <= sum - a[i]; ++j)
			check[j + a[i]] -= check[j];

		for(int j = 1; j <= sum; ++j){
			int Sum = sum + j - a[i];

			if((Sum & 1) || ((Sum >> 1) < j)) continue;
			if(check[Sum >> 1] != 0 && check[(Sum >> 1) - j] != 0) ++num[j];

			ans += (num[j] == n);
		}

		for(int j = sum; j >= a[i]; --j)
			check[j] += check[j - a[i]];
	}

	printf("%d\n", ans);
	if(ans != 0){
		for(int i = 1; i <= sum; ++i)
			if(num[i] == n) printf("%d ", i);
		puts("");
	}
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:13:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
bootfall.cpp:17:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]), sum += a[i];
                                  ^

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 21 / 21
• Subtask 6: 35 / 35