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D.cpp
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D.cpp
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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define dd double
#define ld long double
#define sl(n) scanf("%lld", &n)
#define si(n) scanf("%d", &n)
#define sd(n) scanf("%lf", &n)
#define pll pair <ll, ll>
#define pii pair <int, int>
#define mp make_pair
#define pb push_back
#define inf (1LL << 62)
#define loop(i, start, stop, inc) for(ll i = start; i <= stop; i += inc)
#define for1(i, stop) for(ll i = 1; i <= stop; i++)
#define for0(i, stop) for(ll i = 0; i < stop; i++)
#define rep1(i, start) for(ll i = start; i >= 1; i--)
#define rep0(i, start) for(ll i = (start-1); i >= 0; i--)
#define ms(n, i) memset(n, i, sizeof(n))
#define casep(n) printf("Case %lld:", ++n)
#define pn printf("\n")
#define pf printf
#define fastio std::ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
// http://xorshift.di.unimi.it/splitmix64.c
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
};
ll n, m, x[200009], y[200009];
queue <pll> q;
unordered_map <int, bool, custom_hash> vis;
ll dx[] = {1, -1};
int main()
{
cin >> n >> m;
for1(i, n) {
sl(x[i]);
q.push(mp(x[i],0));
vis[x[i]] = 1;
}
ll idy = 0, tot=0;
while(idy < m) {
pll u = q.front();
q.pop();
for0(i, 2) {
ll nxt = u.first + dx[i];
if(vis.find(nxt) != vis.end())
continue;
vis[nxt] = 1;
y[idy++] = nxt;
tot += (u.second + 1);
q.push(mp(nxt, u.second + 1));
if(idy >= m) break;
}
}
pf("%lld\n", tot);
for0(i, m) {
if(i != 0) pf(" ");
pf("%lld", y[i]);
}
pn;
return 0;
}