이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
// Make the best become better
// No room for laziness
#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e4 + 5;
const int maxK = 205;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n, k, a[maxN], sum[maxN];
int f[maxN][maxK];
void ReadInput()
{
cin >> n >> k;
for(int i=1; i<=n; i++)
{
cin >> a[i];
sum[i] = sum[i - 1] + a[i];
}
}
int get(int l, int r)
{
if(l > r) return 0;
return sum[r] - sum[l - 1];
}
int t = 0;
void DnC(int l, int r, int optl, int optr)
{
if(l > r) return;
int mid = (l + r) / 2;
int res = -oo, id = -1;
for(int i=optl; i<=min(mid, optr); i++)
{
int cost = f[i - 1][t - 1] + get(i, mid) * get(mid + 1, n);
if(res < cost)
{
res = cost;
id = i;
}
}
f[mid][t] = res;
DnC(l, mid - 1, optl, id);
DnC(mid + 1, r, id, optr);
}
void Solve()
{
//cout << get(1, n);return
memset(f, -3, sizeof f);
f[0][0] = 0;
for(int i=1; i<=k; i++)
{
t++;
DnC(1, n, 1, n);
}
int res = -1;
int id = 0;
for(int i=k; i<n; i++)
{
if(res < f[i][k])
{
res = f[i][k];
id = i;
}
}
cout << res << '\n';
int tmp = res;
vector<int> trace;
trace.pb(id);
for(int i=id-1; i>=1; i--)
{
if(f[i][k - 1] + get(i + 1, id) * get(id + 1, n) == res)
{
trace.pb(i);
id = i;
res = f[i][k - 1];
k--;
}
}
reverse(trace.begin(), trace.end());
for(int v : trace) cout << v << " ";
}
int32_t main()
{
//freopen("sol.inp", "r", stdin);
// freopen("sol.out", "w", stdout);
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
ReadInput();
Solve();
}
컴파일 시 표준 에러 (stderr) 메시지
sequence.cpp: In function 'void Solve()':
sequence.cpp:74:9: warning: unused variable 'tmp' [-Wunused-variable]
74 | int tmp = res;
| ^~~
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