Submission #224189

#	Time	Username	Problem	Language	Result	Execution time	Memory
224189		_7_7_	Cake 3 (JOI19_cake3)	C++14	100 / 100	1311 ms	207972 KiB

cake3

#include <bits/stdc++.h>                                           
 
#define int long long
//#pragma GCC optimize("Ofast")
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4")
 
 
#define file(s) freopen(s".in","r",stdin); freopen(s".out","w",stdout);
#define forev(i, b, a) for(int i = (b); i >= (a); --i)
#define forn(i, a, b) for(int i = (a); i <= (b); ++i)
#define all(x) x.begin(), x.end()
#define sz(s) (int)s.size()
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define s second
#define f first
 
 
using namespace std;
 
 
typedef pair < long long, long long > pll;    
typedef pair < int, int > pii;
typedef unsigned long long ull;         
typedef vector < pii > vpii;
typedef vector < int > vi;
typedef long double ldb;  
typedef long long ll;  
typedef double db;                             
 
 
const int inf = 1e9, maxn = 4e5 + 148, mod = 1e9 + 7, N = 2e5 + 11;
const int dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1}, block = 333;
const pii base = mp(1171, 3307), Mod = mp(1e9 + 7, 1e9 + 9);
const db eps = 1e-12, pi = 3.14159265359;
const ll INF = 1e18;
 
 
int n, k, ans = -INF, b[N];
pii a[N];
vi x;

struct node {
	node *l, *r;
	int cnt, sum;

	node () {
		l = r = NULL;
		sum = cnt = 0;
	}

	node (int c, int s, int x) {
		l = r = NULL;
		cnt = c;
		sum = s;
	}

	node (node *L, node *R) {
		l = L;
		r = R;
		cnt = (!l ? 0 : l->cnt) + (!r ? 0 : r->cnt);
		sum = (!l ? 0 : l->sum) + (!r ? 0 : r->sum);
	}
};
typedef node * pnode;
pnode root[N];

pnode build (int tl = 0, int tr = N) {
	if (tl == tr) 
		return new node();
	int tm = (tl + tr) >> 1;
	return new node(build(tl, tm), build(tm + 1, tr));
}

pnode update (pnode t, int pos, int tl = 0, int tr = N) {
	if (tl == tr)
		return new node(t->cnt + 1, t->sum + x[sz(x) - 1 - pos], 0);
	int tm = (tl + tr) >> 1;
	if (pos <= tm)
		return new node(update(t->l, pos, tl, tm), t->r);
	return new node(t->l, update(t->r, pos, tm + 1, tr));
}


int get (pnode t1, pnode t2, int k, int tl = 0, int tr = N) {
	if (!k)
		return 0;
	if (tl == tr) 
		return x[sz(x) - tl - 1] * k; 
	
	int tm = (tl + tr) >> 1;
	if (t1->l->cnt - t2->l->cnt >= k)
		return get(t1->l, t2->l, k, tl, tm);
	return t1->l->sum - t2->l->sum + get(t1->r, t2->r, k - t1->l->cnt + t2->l->cnt, tm + 1, tr);
}

int cost (int l, int r) {
	return a[l].f + a[l].s + a[r].s - a[r].f + get(root[r - 1], root[l], k - 2);
}

void calc (int l = 1, int r = n - k + 1, int tl = 1, int tr = n) {
	if (l > r)
		return;
	int m = (l + r) >> 1, mx = -INF, tm = -1;
	for (int i = max(m + k - 1, tl); i <= tr; ++i) {
		int cur = cost(m, i);
		if (cur > mx) {
			mx = cur;
			tm = i;
		}
	}

	ans = max(ans, mx);
	calc(l, m - 1, tl, tm);
	calc(m + 1, r, tm, tr);
}



main () {
	scanf("%lld%lld", &n, &k);
	for (int i = 1; i <= n; ++i) {
		scanf("%lld%lld", &a[i].s, &a[i].f); 
		a[i].f += a[i].f;
		x.pb(a[i].s);
	}
	
	sort(a + 1, a + 1 + n);
		
	sort(all(x));
	x.resize(unique(all(x)) - x.begin());

	root[0] = build();	
	for (int i = 1; i <= n; ++i) {
		b[i] = lower_bound(all(x), a[i].s) - x.begin();
		root[i] = update(root[i - 1], sz(x) - 1 - b[i]);
	}

	calc();
	cout << ans << endl;	
}
 
 

Compilation message (stderr)

cake3.cpp:122:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^
cake3.cpp: In function 'int main()':
cake3.cpp:123:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld", &n, &k);
  ~~~~~^~~~~~~~~~~~~~~~~~~~
cake3.cpp:125:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld", &a[i].s, &a[i].f); 
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 19 / 19
• Subtask 3: 76 / 76