이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>
using namespace std;
const long long oo = 1000000000000000000;
long long int sum, ans = 0, mx = 0, mn = 1e9, num, pos;
/*
ViHHiPuh
(( `'-""``""-'` ))
)-__-_.._-__-(
/ --- (o _ o) --- \
\ .-* ( .0. ) *-. /
_'-. ,_ '=' _, .-'_
/ `;#'#'# - #'#'#;` \
\_)) -----'#'----- ((_/
# --------- #
'# ------- ------ #'
/..-'# ------- #'-.\
_\...-\'# -- #'/-.../_
((____)- '#' -(____))
cout << fixed << setprecision(6) << x;
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
freopen ( "sum.in", "r", stdin )
*/
int main () {
int n, m;
cin >> n >> m;
int a[ n + 1 ];
for ( int i = 0; i < n; i ++ ) {
cin >> a[ i ];
sum += a[ i ];
}
mn = sum;
ans = mx = 0;
for ( int mask = 1; mask < ( 1 << ( n - 1 ) ); mask ++ ) {
if ( __builtin_popcount( mask ) != m )
continue;
for ( int i = 0; i < n - 1; i ++ ) {
num += a[ i ];
sum -= a[ i ];
if ( mask & ( 1 << i ) ) {
ans += num * sum;
num = 0;
}
}
if ( mx < ans ) {
mx = ans;
pos = mask;
}
num = ans = 0;
sum = mn;
}
cout << mx << "\n";
for ( int i = 0; i < n - 1; i ++ ) {
if ( pos & ( 1 << i ) )
cout << i + 1 << " ";
}
}
/*
7 3
4 1 3 4 0 2 3
*/
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