Submission #315310

#	Time	Username	Problem	Language	Result	Execution time	Memory
315310		dolphingarlic	Bootfall (IZhO17_bootfall)	C++14	65 / 100	1092 ms	888 KiB

bootfall

#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("O3")
#pragma GCC target("sse4,avx2,fma,avx")
using namespace std;

int main() {
    int n, a[500], tot = 0;
    scanf("%d", &n);
    bitset<250001> base;
    base[0] = 1;
    for (int i = 0; i < n; i++) {
        scanf("%d", a + i);
        tot += a[i];
        base |= base << a[i];
    }
    if ((tot & 1) || !base[tot >> 1]) return printf("0"), 0;

    bitset<250001> ans;
    for (int i = 1; i <= tot; i++) ans[i] = 1;

    for (int i = 0; i < n; i++) {
        bitset<250001> possible, good;
        possible[0] = 1;
        for (int j = 0; j < n; j++) if (j != i) possible |= possible << a[j];
        for (int j = tot - a[i] & 1; j <= tot - a[i]; j += 2) good[j] = possible[tot - a[i] - j >> 1];
        ans &= good;
    }

    printf("%d\n", ans.count());
    for (int i = 0; i <= tot; i++) if (ans[i]) printf("%d ", i);
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:26:26: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   26 |         for (int j = tot - a[i] & 1; j <= tot - a[i]; j += 2) good[j] = possible[tot - a[i] - j >> 1];
      |                      ~~~~^~~~~~
bootfall.cpp:26:93: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   26 |         for (int j = tot - a[i] & 1; j <= tot - a[i]; j += 2) good[j] = possible[tot - a[i] - j >> 1];
      |                                                                                  ~~~~~~~~~~~^~~
bootfall.cpp:30:14: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::size_t' {aka 'long unsigned int'} [-Wformat=]
   30 |     printf("%d\n", ans.count());
      |             ~^     ~~~~~~~~~~~
      |              |              |
      |              int            std::size_t {aka long unsigned int}
      |             %ld
bootfall.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
bootfall.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |         scanf("%d", a + i);
      |         ~~~~~^~~~~~~~~~~~~

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