UVa1614 Hell on the Markets (贪心,结论)

Posted 2020-08-09

链接：http://bak.vjudge.net/problem/UVA-1614

分析：http://blog.csdn.net/wcr1996/article/details/43957461

有了这个结论，接下来就是贪心搞一搞了。

 

 1 #include <cstdio>
 2 #include <algorithm>
 3 #include <cstring>
 4 using namespace std;
 5 
 6 const int maxn = 100000 + 5;
 7 
 8 int n;
 9 pair<int, int> a[maxn];
10 int sign[maxn];
11 
12 int main() {
13     while (scanf("%d", &n) == 1) {
14         long long sum = 0;
15         for (int i = 0; i < n; i++) {
16             int x; scanf("%d", &x); sum += x;
17             a[i] = make_pair(x, i);
18         }
19         if (sum & 1) { printf("No\n"); continue; }
20         sort(a, a + n);
21         memset(sign, -1, sizeof(sign));
22         sum /= 2;
23         for (int i = n - 1; i >= 0; i--)
24             if (a[i].first <= sum) { sum -= a[i].first; sign[a[i].second] = 1; }
25             else if (sum == 0) break;
26         printf("Yes\n");
27         for (int i = 0; i < n; i++) printf("%d%c", sign[i], i == n - 1 ? ‘\n‘: ‘ ‘);
28     }
29     return 0;
30 }