#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <array>
#include <string>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <utility>
#include <random>
#include <cassert>
#include <fstream>
using namespace std;
mt19937 rnd(time(nullptr));
/* -------------------- Typedefs -------------------- */
typedef int itn;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef float fl;
typedef long double ld;
/* -------------------- Usings -------------------- */
using vi = vector<int>;
using vll = vector<ll>;
using mii = map<int, int>;
using mll = map<ll, ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
/* -------------------- Defines -------------------- */
#define ff first
#define ss second
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mpr make_pair
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define all(x) (x).begin(), (x).end()
#define USACO freopen("feast.in", "r", stdin); freopen("feast.out", "w", stdout);
/* -------------------- Constants -------------------- */
const int dx[8] = { -1, 0, 1, 0, -1, -1, 1, 1 };
const int dy[8] = { 0, -1, 0, 1, -1, 1, -1, 1 };
const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18) + 5ll;
const ll MOD = ll(1000000007);
const ll MOD2 = ll(998244353);
/* -------------------- Functions -------------------- */
void fastio() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
void precision(int x) {
cout.setf(ios::fixed | ios::showpoint);
cout.precision(x);
}
ll gcd(ll a, ll b) {
if (a == 0 || b == 0) return(max(a, b));
while (b) {
a %= b;
swap(a, b);
}
return a;
}
ll lcm(ll a, ll b) {
return a / gcd(a, b) * b;
}
ll range_sum(ll a, ll b) {
if (a > b) return 0ll;
ll dif = a - 1, cnt = b - a + 1;
ll ans = ((b - a + 1) * (b - a + 2)) / 2;
ans += ((b - a + 1) * dif);
return ans;
}
string dec_to_bin(ll a) {
string s = "";
for (ll i = a; i > 0; ) {
ll k = i % 2;
i /= 2;
char c = k + 48;
s += c;
}
if (a == 0) {
s = "0";
}
reverse(all(s));
return s;
}
ll bin_to_dec(string s) {
ll num = 0;
for (int i = 0; i < s.size(); i++) {
num *= 2ll;
num += (s[i] - '0');
}
return num;
}
ll factorial_by_mod(ll n, ll mod) {
ll ans = 1;
ll num;
for (ll i = 1; i <= n; ++i) {
num = i % mod;
ans *= num;
ans %= mod;
}
return ans;
}
bool isPrime(ll a) {
if (a == 1) return false;
for (ll i = 2; i * i <= a; i++) {
if (a % i == 0) return false;
}
return true;
}
ll binpow(ll a, ll b) {
if (!a) return 0;
ll ans = 1;
while (b) {
if (b & 1) {
ans *= a;
}
b >>= 1;
a *= a;
}
return ans;
}
ll binpow_by_mod(ll a, ll b, ll mod) {
if (!a) return 0;
ll ans = 1;
while (b) {
if (b & 1) {
ans *= a;
ans %= mod;
}
b >>= 1;
a *= a;
a %= mod;
}
return ans;
}
/* -------------------- Solution -------------------- */
const int N = 100005, M = 105, L = 20;
int a[N], near[N], dp[N][M], st[N][L], pref[N];
int n, k, lg;
void bld(int kx) {
for (int i = 1; i <= n; ++i) {
st[i][0] = dp[i][kx];
}
for (int l = 1; l <= lg; ++l) {
for (int i = 1; i + (1 << l) - 1 <= n; ++i) {
st[i][l] = min(st[i][l - 1], st[i + (1 << (l - 1))][l - 1]);
}
}
}
int qry(int l, int r) {
int lgx = log2(r - l + 1);
return min(st[l][lgx], st[r - (1 << lgx) + 1][lgx]);
}
void slv() {
cin >> n >> k;
lg = log2(n);
int ans = MAX;
for (int i = 1; i <= n; ++i) {
cin >> a[i];
pref[i] = max(pref[i - 1], a[i]);
}
near[n] = n + 1;
dp[n][1] = a[n];
for (int i = n - 1; i >= 1; --i) {
int ind = i + 1;
while (ind <= n) {
if (a[ind] > a[i]) break;
ind = near[ind];
}
near[i] = ind;
if (near[ind] == n + 1) {
dp[i][1] = a[i];
}
else {
dp[i][1] = MAX;
}
}
bld(1);
for (int kx = 2; kx <= k; ++kx) {
for (int i = n; i > n - kx + 1; --i) {
dp[i][kx] = MAX;
}
for (int i = n - kx + 1; i >= 1; --i) {
int r = near[i];
if (r == n + 1) --r;
dp[i][kx] = qry(i + 1, r) + a[i];
}
if (kx == k) break;
bld(kx);
}
for (int i = 1; i <= n; ++i) {
if (pref[i] != a[i]) break;
ans = min(ans, dp[i][k]);
}
cout << ans;
}
void cs() {
int tstc = 1;
//cin >> tstc;
while (tstc--) {
slv();
}
}
void precalc() {
return;
}
int main() {
fastio();
precalc();
//precision(0);
cs();
return 0;
}
Compilation message
blocks.cpp: In function 'll range_sum(ll, ll)':
blocks.cpp:97:21: warning: unused variable 'cnt' [-Wunused-variable]
97 | ll dif = a - 1, cnt = b - a + 1;
| ^~~
blocks.cpp: In function 'll bin_to_dec(std::string)':
blocks.cpp:120:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
120 | for (int i = 0; i < s.size(); i++) {
| ~~^~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
6480 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
6480 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4432 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
4432 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
6480 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
6480 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
6480 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
6480 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
