0_0_21592091_26873.cpp:1:13: error: expected constructor, destructor, or type conversion before '(' token
sort(a,a+n);
^
0_0_21592091_26873.cpp:2:9: error: 'len' does not name a type
len=2*a[n-1];///缩小区间
^
0_0_21592091_26873.cpp:3:9: error: expected unqualified-id before 'for'
for(int i=0;i<n;i++)///去掉本身选两次的情况
^
0_0_21592091_26873.cpp:3:21: error: 'i' does not name a type
for(int i=0;i<n;i++)///去掉本身选两次的情况
^
0_0_21592091_26873.cpp:3:25: error: 'i' does not name a type
for(int i=0;i<n;i++)///去掉本身选两次的情况
^
0_0_21592091_26873.cpp:5:9: error: expected unqualified-id before 'for'
for(int i=1;i<=len;i++)///选择的无序,除以2
^
0_0_21592091_26873.cpp:5:21: error: 'i' does not name a type
for(int i=1;i<=len;i++)///选择的无序,除以2
^
0_0_21592091_26873.cpp:5:28: error: 'i' does not name a type
for(int i=1;i<=len;i++)///选择的无序,除以2
^
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