UVa1149 Bin Packing (贪心)

 1 #include <cstdio>
 2 #include <algorithm>
 3 using namespace std;
 4 
 5 const int maxn = 100000 + 5;
 6 
 7 int a[maxn];
 8 
 9 int main() {
10     int T;
11     scanf("%d", &T);
12     for (int kase = 0; kase < T; kase++) {
13         if (kase) printf("\n");
14         int n, l;
15         scanf("%d%d", &n, &l);
16         for (int i = 0; i < n; i++) scanf("%d", &a[i]);
17         sort(a, a + n);
18         int L = 0, R = n-1, ans = 0;
19         while (L <= R) {
20             if (L == R) { ans++; break; }
21             if (a[L] + a[R] <= l) { ans++; L++; R--; }
22             else { ans++; R--; }
23         }
24         printf("%d\n", ans);
25     }
26     return 0;
27 }