Submission #211283

#	Time	Username	Problem	Language	Result	Execution time	Memory
211283		nouvo25	Bootfall (IZhO17_bootfall)	C++14	44 / 100	1039 ms	1524 KiB

bootfall

#include <bits/stdc++.h>

using namespace std;

const int maxn = 507;

int n, a[maxn], cnt[maxn*maxn], s = 0;
bitset<maxn*maxn> f, tmp;
vector<int> ans;

int main()
{
//    freopen("test.INP","r",stdin);
    scanf("%d",&n);
    for (int i = 1; i <= n; ++i) scanf("%d",&a[i]), s += a[i];
    if (s % 2) return puts("0"), 0;

    f[0] = 1;
    for (int i = 1; i <= n; ++i)
        tmp = f, tmp <<= a[i], f |= tmp;
    if (!f[s / 2]) return puts("0"), 0;

    for (int i = 1; i <= n; ++i)
    {
        s -= a[i];
        for (int j = 1; j <= s; ++j) f[j] = 0;
        for (int j = 1; j <= n; ++j)
            if (j != i) tmp = f, tmp <<= a[j], f |= tmp;
        for (int j = 0; j <= s; ++j)
            if (f[j]) cnt[abs(s - 2*j)] += f[j];
        s += a[i];
    }

    for (int i = 0; i <= s; ++i)
        if (cnt[i] == 2*n) ans.push_back(i);
    printf("%d\n",ans.size());
    for (auto v: ans) printf("%d ",v);
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:36:29: 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:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
bootfall.cpp:15:51: 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]), s += a[i];
                                  ~~~~~~~~~~~~~~~~~^~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35