Submission #169946

#	Time	Username	Problem	Language	Result	Execution time	Memory
169946		Dovran	Bootfall (IZhO17_bootfall)	C++11	100 / 100	435 ms	3568 KiB

bootfall

#include <bits/stdc++.h>
#define N 1000009
#define pii pair <int, int>
#define ff first
#define ss second
#define pb push_back
#define ll long long

using namespace std;

int n, m, v[N], sum, vis[N], ism;
int an[N];
vector<int>ans;

int main(){
	scanf("%d", &n);
	for(int i=1; i<=n; i++)
		scanf("%d", &v[i]), sum+=v[i];
	
	vis[0] = 1;
	
	for(int i = 1; i <= n;i++)
		for(int j = sum; j >= 0; j--)
			vis[j+v[i]] += vis[j];
			
	if(sum%2==1 or vis[sum/2]==0)
		return cout<<0, 0;
	
	for(int i = 1; i <= n; i++){
		for(int j = v[i]; j <= sum;j++)
			vis[j] -= vis[j - v[i]];
		for(int j = 1; j < sum; j++){
			if(an[j]<i-1)
				continue;
			ism = sum - v[i] + j;
			if(ism % 2 == 0 and ism / 2 - j >= 0 and vis[ism / 2 - j])
				an[j]++;
		}
		for(int j = sum; j >= v[i]; j--)
			vis[j] += vis[j - v[i]];
	}
	for(int i = 1; i <= sum; i++)
		if(an[i] == n) ans.pb(i);
	printf("%d\n", ans.size());
	for(auto i : ans)
		printf("%d ", i);
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:44:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d\n", ans.size());
                 ~~~~~~~~~~^
bootfall.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
bootfall.cpp:18:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &v[i]), sum+=v[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