- it
- CCF CSP 竞赛试题——小中大（201903-1）
浮点计算是不精确的
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std
;
void print(int x
) {
cout
<< x
/ 2 << (x
& 1 ? ".5 " : " ");
}
int main() {
int n
;
cin
>> n
;
vector
<int> A(n
);
for (int i
= 0; i
< n
; ++i
) cin
>> A
[i
];
vector
<int> res(3);
res
[0] = A
[0] << 1, res
[1] = A
[n
- 1] << 1, res
[2] = A
[(n
- 1) / 2] + A
[n
/ 2];
sort(res
.begin(), res
.end());
for (int i
= 2; i
>= 0; --i
) print(res
[i
]);
return 0;
}
