Submission #36181

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
36181	2017-12-06 07:20:30	ToMoClone	Bootfall (IZhO17_bootfall)	C++14	100 / 100	679 ms	6976 KiB

bootfall

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/*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;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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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