Submission #342653

#	Time	Username	Problem	Language	Result	Execution time	Memory
342653		maskoff	K blocks (IZhO14_blocks)	C++14	0 / 100	1 ms	384 KiB

blocks

#include <bits/stdc++.h>

#define file ""

#define all(x) x.begin(), x.end()

#define sc second
#define fr first

#define pb push_back
#define mp make_pair

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const ll inf = 1e18 + 5;
const ll mod = 1e9 + 7;

const int N = 1e6 + 5;

int dx[] = {+1, 0, -1, 0};
int dy[] = {0, +1, 0, -1};

struct line {
	ll tag;
	ll ans;
	ll mx;
}	t[N];

ll a[N], l[N], n, k, dp[N]; 

void push(int u, int l, int r) {
 	if (l == r || t[u].tag == -1) return;
 	int m = l + r >> 1;
 	t[u + u].ans -= t[u + u].mx;
 	t[u + u + 1].ans -= t[u + u + 1].mx;

 	t[u + u].mx = max(t[u].tag, t[u + u].mx);
 	t[u + u + 1].mx = max(t[u].tag, t[u + u + 1].mx);

 	t[u + u].ans += t[u + u].mx;
 	t[u + u + 1].ans += t[u + u + 1].mx;

 	t[u + u].tag = max(t[u + u].tag, t[u].tag);
 	t[u + u + 1].tag = max(t[u + u + 1].tag, t[u].tag);
 	return;
}

void update_mx(int u, int ul, int ur, int l, int r, ll val) {
	push(u, ul, ur);
	if (l > ur || ul > r) return;
	if (l <= ul && ur <= r) {
	 	t[u].ans -= t[u].mx;
	 	t[u].mx = max(t[u].mx, val);
	 	t[u].ans += t[u].mx;
	 	t[u].tag = max(t[u].tag, val);
	 	return;
 	}
 	int um = ul + ur >> 1;
 	update_mx(u + u, ul, um, l, r, val);
 	update_mx(u + u + 1, um + 1, ur, l, r, val);
 	t[u].ans = min(t[u + u].ans, t[u + u + 1].ans); 
}

void update(int u, int l, int r, int pos, ll val) {	
	if (l == r) {
		t[u].ans = val;
		return;		 	
	}
	int m = l + r >> 1;
	if (pos <= m) update(u + u, l, m, pos, val);
	else update (u + u + 1, m + 1, r, pos, val);
	t[u].ans = min(t[u + u].ans, t[u + u + 1].ans); 
}

void clear(int u, int l, int r) {
 	t[u].tag = -1, t[u].ans = 1e9, t[u].mx = 0;
 	if (l == r) return;
 	int m = l + r >> 1;
 	clear(u * 2, l, m);
 	clear(u * 2 + 1, m + 1, r);
}

int get(int u, int ul, int ur, int l, int r) {
	push(u, ul, ur);
 	if (l > ur || ul > r) return 1e9 * 1ll;
 	if (l <= ul && ur <= r) return t[u].ans;
 	int um = ul + ur >> 1;
 	return min(get(u + u, ul, um, l, r), get(u + u + 1, um + 1, ur, l, r));
}

int main() {   
	ios_base :: sync_with_stdio(false);               
	cin.tie(nullptr);
	srand(time(nullptr));
	cin >> n >> k;

	a[0] = 1e9;
	for (int i = 1; i <= n; i++) cin >> a[i];
	ll mx = 0;
	for (int i = 1; i <= n; i++) mx = max(mx, a[i]), dp[i] = mx;

	stack<int> s;
	s.push(0);
	for (int i = 1; i <= n; i++) {
	 	while (a[s.top()] <= a[i]) s.pop();
	 	l[i] = s.top() + 1;
	}

	clear(1, 1, n);
	for (int i = 1; i <= n; i++) 
	 		update(1, 1, n, i, dp[i - 1]);

	for (int block = 2; block <= k; block++) {
	 	for (int i = block; i <= n; i++) {
	 	 	update_mx(1, 1, n, l[i], i, a[i]);
	 	 	dp[i] = get(1, 1, n, block, i);
	 	}
	 	clear(1, 1, n);
	 	for (int i = block; i <= n; i++) 
	 		update(1, 1, n, i, dp[i - 1]);
	}
	cout << dp[n];

  return 0;
}                          	

Compilation message (stderr)

blocks.cpp: In function 'void push(int, int, int)':
blocks.cpp:36:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   36 |   int m = l + r >> 1;
      |           ~~^~~
blocks.cpp:36:7: warning: unused variable 'm' [-Wunused-variable]
   36 |   int m = l + r >> 1;
      |       ^
blocks.cpp: In function 'void update_mx(int, int, int, int, int, ll)':
blocks.cpp:61:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   61 |   int um = ul + ur >> 1;
      |            ~~~^~~~
blocks.cpp: In function 'void update(int, int, int, int, ll)':
blocks.cpp:72:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   72 |  int m = l + r >> 1;
      |          ~~^~~
blocks.cpp: In function 'void clear(int, int, int)':
blocks.cpp:81:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   81 |   int m = l + r >> 1;
      |           ~~^~~
blocks.cpp: In function 'int get(int, int, int, int, int)':
blocks.cpp:90:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   90 |   int um = ul + ur >> 1;
      |            ~~~^~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47