Submission #36153

#	Time	Username	Problem	Language	Result	Execution time	Memory
36153		minhtung0404	Bootfall (IZhO17_bootfall)	C++14	100 / 100	453 ms	4884 KiB

bootfall

#include<bits/stdc++.h>
const int N = 505;
using namespace std;

vector <int> dp, f, ck;
int n, sum, a[N], cnt;

int main(){
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {scanf("%d", &a[i]); sum += a[i];}
    dp.assign(sum+1, 0); dp[0] = 1; sum = 0;
    for (int i = 1; i <= n; i++) {sum += a[i]; for (int j = sum; j >= 0; j--) if (j >= a[i]) dp[j] += dp[j-a[i]];}
    if (sum % 2 == 1 || dp[sum/2] == 0){
        printf("0"); return 0;
    }
    f.assign(sum+1, 0); ck.assign(sum+1, 0);
    for (int num = 1; num <= n; num++) {
        for (int i = 0; i <= sum; i++){
            f[i] = dp[i];
            if (i >= a[num]) f[i] -= f[i-a[num]];
            if (f[i] != 0 && 2*i+a[num]-sum >= 0) ck[2*i+a[num]-sum]++;
        }
    }
    for (int i = 0; i <= sum; i++) if (ck[i] == n) cnt++;
    printf("%d\n", cnt);
    for (int i = 0; i <= sum; i++) if (ck[i] == n) printf("%d ", i);
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:9:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
bootfall.cpp:10:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 1; i <= n; i++) {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