Created
April 2, 2019 11:40
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#include <iostream> | |
#include <vector> | |
#include <algorithm> | |
#include <math.h> | |
using namespace std; | |
int main() | |
{ | |
// input | |
int n,w,tmp,res=0,flag; | |
cin >> n; | |
cin >> w; | |
vector<int> weight(n,0); | |
flag = n; | |
// vector<bool> flag(n,0); | |
for(int i = 0; i < n ; i++){ | |
cin >> tmp; | |
weight[i] = tmp; | |
} | |
// sort | |
sort(weight.begin(), weight.end()); | |
// combine | |
// 排序后,首尾指针往中间逼近 | |
int l=0,r=weight.size()-1; | |
while(l<r){ | |
if(weight[l]+weight[r] <= w){ | |
l++; | |
}else{ | |
res+=2; | |
flag-=2; | |
l++; | |
r--; | |
} | |
} | |
res += (int) ceil(flag/2.0); | |
cout <<res <<endl; | |
} |
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