이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF (1LL << 55)
#define MOD (1000 * 1000 * 1000 + 7)
#define maxn 100111
#define maxk 211
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
struct line{
ll k, n;
int ind;
};
vector<line> env;
int best_ind;
bool bad(int l1, int l2, int l3){
return (env[l3].n - env[l1].n) * (env[l1].k - env[l2].k) < (env[l2].n - env[l1].n) * (env[l1].k - env[l3].k);
}
void add(line a){
if(env.size() > 0){
if(env.back().k == a.k){
if(a.n > env.back().n)
env.pop_back();
else
return;
}
}
env.pb(a);
while(env.size() >= 3 && bad(env.size() - 3, env.size() - 2, env.size() - 1))
env.erase(env.end() - 2);
}
ll val(int ind, ll x){
return env[ind].k * x + env[ind].n;
}
pair<ll, int> query(ll x){
if(best_ind >= env.size())
best_ind = env.size() - 1;
while(best_ind + 1 < env.size() && val(best_ind, x) <= val(best_ind + 1, x))
best_ind++;
return mp(val(best_ind, x), env[best_ind].ind);
}
ll dp[maxn][2], pre[maxn], arr[maxn];
int from[maxn][maxk];
ll sum(int i, int j){
if(i > j)
return 0LL;
return pre[j] - pre[i - 1];
}
int main(){
int n, k;
scanf("%d%d", &n, &k);
for(int i = 1; i <= n; i++){
scanf("%lld", arr + i);
pre[i] = pre[i - 1] + arr[i];
}
for(int i = 0; i <= n; i++){
for(int j = 0; j < 2; j++)
dp[i][j] = -INF;
}
for(int i = 1; i <= n - 1; i++)
dp[i][1] = sum(1, i) * sum(i + 1, n);
for(int j = 2; j <= k; j++){
env.clear();
best_ind = 0;
int jj = j % 2;
int prev = 1 - jj;
for(int i = j; i <= n - 1; i++){
add({-sum(1, i - 1), dp[i - 1][prev], i - 1});
pair<ll, int> cur = query( sum(i + 1, n) );
dp[i][jj] = cur.fi + sum(i + 1, n) * sum(1, i);
from[i][j] = cur.se;
}
}
int ans = 0;
for(int i = 1; i <= n - 1; i++){
if(dp[i][k % 2] > dp[ans][k % 2])
ans = i;
}
printf("%lld\n", dp[ans][k % 2]);
for(int i = k; i >= 1; i--){
printf("%d ", ans);
ans = from[ans][i];
}
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
sequence.cpp: In function 'std::pair<long long int, int> query(ll)':
sequence.cpp:50:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(best_ind >= env.size())
~~~~~~~~~^~~~~~~~~~~~~
sequence.cpp:53:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(best_ind + 1 < env.size() && val(best_ind, x) <= val(best_ind + 1, x))
~~~~~~~~~~~~~^~~~~~~~~~~~
sequence.cpp: In function 'int main()':
sequence.cpp:72:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &n, &k);
~~~~~^~~~~~~~~~~~~~~~
sequence.cpp:74:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%lld", arr + i);
~~~~~^~~~~~~~~~~~~~~~~
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |