이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
/*
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
*/
#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//using namespace __gnu_pbds;
using namespace std;
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int>vi;
typedef vector<vector<int>>vvi;
typedef vector<ll>vl;
typedef vector<vl> vvl;
typedef pair<int,int>pi;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld,ld> pld;
typedef vector<pi> vpi;
//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T> ostream& operator<<(ostream& os, vector<T>& a){os<<"[";for(int i=0; i<ll(a.size()); i++){os << a[i] << ((i!=ll(a.size()-1)?" ":""));}os << "]\n"; return os;}
#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define outfl(x){cout << x << endl;return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map
template<typename T1, typename T2> istream& operator>>(istream& is, pair<T1, T2>& p){is >> p.first >> p.second;return is;}
template<typename T1, typename T2> ostream& operator<<(ostream& os, pair<T1, T2>& p){os <<"" << p.first << " " << p.second << ""; return os;}
void usaco(string taskname){
string fin = taskname + ".in";
string fout = taskname + ".out";
const char* FIN = fin.c_str();
const char* FOUT = fout.c_str();
freopen(FIN, "r", stdin);
freopen(FOUT, "w", stdout);
}
template<typename T>
void read(vector<T>& v){
int n=v.size();
for(int i=0; i<n; i++)
cin >> v[i];
}
template<typename T>
vector<T>UNQ(vector<T>a){
vector<T>ans;
for(T t:a)
if(ans.empty() || t!=ans.back())
ans.push_back(t);
return ans;
}
void solve();
int main(){
GLHF;
int t=1;
//cin >> t;
while(t--)
solve();
}
struct line{
ll m,b,ix;
ll get(ll x){return m*x+b;}
line(ll m,ll b,ll ix):m(m),b(b),ix(ix){}
line(){}
};
struct seg{
ll l,r,m;
seg* lp=0,*rp=0;
line* ln=0;
seg(ll l,ll r):l(l),r(r),m((l+r)/2){
ln=new line(-1e9,-1e9,-1e9);
}
void expand(){
if(!lp)lp=new seg(l,m);
if(!rp)rp=new seg(m,r);
}
void upd(line* f){
bool lef=f->get(l)>ln->get(m);
bool mid=f->get(m)>ln->get(m);
if(mid)
swap(f,ln);
if(l+1==r)return;
expand();
if(lef!=mid)
lp->upd(f);
else
rp->upd(f);
}
pl qur(ll x){
if(l+1==r)return {ln->get(x),ln->ix};
expand();
if(x<m)return max(lp->qur(x), {ln->get(x),ln->ix});
else return max(rp->qur(x), {ln->get(x),ln->ix});
}
};
void solve() {
int n,k;
cin >> n >> k;
vl a(n+1);
for(int i=1; i<=n; i++)
cin >> a[i];
vl pref(n+1);
for(int i=0; i<=n; i++)
pref[i]=(i?pref[i-1]:0)+a[i];
auto sum=[&](int l,int r){return pref[r]-(l?pref[l-1]:0);};
vvl dp(n+1,vl(k+1)),prv(n+1,vl(k+1,1));
vector<seg*>s(k+1);
for(int i=0; i<=k; i++)
s[i]=new seg(0,1e9);
for(int i=1; i<=n; i++) {
for (int j = 1; j <= k; j++) {
pl p=s[j]->qur(pref[i]);
dp[i][j] = p.first,prv[i][j]=p.second;
}
for(int j=0; j<=k; j++)
if (i != n)
s[j]->upd(new line(pref[i], -pref[i] * pref[i] + (j?dp[i][j-1]:0),i));
}
cout << dp[n][k] << "\n";
int i=n,j=k;
vi ans;
while(i && j){
ans.pb(prv[i][j]);
i=prv[i][j];
j--;
}
sort(all(ans));
ans=UNQ(ans);
print(ans)
}
/*
7 3
4 1 3 4 0 2 3
*/
컴파일 시 표준 에러 (stderr) 메시지
sequence.cpp: In function 'void solve()':
sequence.cpp:131:10: warning: variable 'sum' set but not used [-Wunused-but-set-variable]
131 | auto sum=[&](int l,int r){return pref[r]-(l?pref[l-1]:0);};
| ^~~
sequence.cpp: In function 'void usaco(std::string)':
sequence.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
47 | freopen(FIN, "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~
sequence.cpp:48:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
48 | freopen(FOUT, "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~
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