Submission #134971

#	Time	Username	Problem	Language	Result	Execution time	Memory
134971		claudy	Sails (IOI07_sails)	C++14	100 / 100	132 ms	2800 KiB

sails

//# pragma GCC optimize("Ofast,no-stack-protector")
//# pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
# pragma GCC optimize("Ofast")
# pragma GCC optimization ("unroll-loops")
# include "bits/stdc++.h"
/*
# include <ext/pb_ds/tree_policy.hpp>
# include <ext/pb_ds/assoc_container.hpp>
# include <ext/rope>
*/
std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}};
# define ll long long
# define clock (clock() * 1000.0 / CLOCKS_PER_SEC)
# define rc(s) return cout << s,0
# define rcg(s) cout << s;exit(0)
# define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
# define db(x) cerr << #x << " = " << x << '\n'
# define pb push_back
# define mp make_pair
# define all(s) s.begin(),s.end()
# define sz(x) (int)((x).size())
# define int ll
using namespace std;

/*
using namespace __gnu_pbds;
using namespace __gnu_cxx;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
Tree<int>tr;
*/

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# define LOCAL
# define sim template < class c
# define ris return * this
# define dor > debug & operator <<
# define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
*this << "[";
for (auto it = d.b; it != d.e; ++it)
*this << ", " + 2 * (it == d.b) << *it;
ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define show(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
int gcd(int a, int b)
{
if(b) return gcd(b,a%b);
return a;
}mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

int n,h,k,ans,a[1 << 17];
vector<pair<int,int>>vec;
const int N = 100005;

void upd(int idx,int val)
{
	for(int i = idx;i <= N;i += (i & (-i))) a[i] += val;
}

int qry(int idx)
{
	int x = 0;
	if(idx == 0) return 0;
	for(int i = idx;i;i -= (i & (-i))) x += a[i];
	return x;
}

// 1:00

int32_t main(){_
	//freopen("input","r",stdin);
	cin >> n;
	for(int i = 1;i <= n;i++)
	{
		cin >> h >> k;
		vec.pb(mp(h,k));
	}
	sort(vec.begin(),vec.end());
	int mx = 1,cnt = 0;
	for(auto it : vec)
	{
		h = it.first;k = it.second;
		//cout << h << ' ' << k << '\n';
		while(cnt < h)
		{
			cnt++;
			upd(cnt,mx - qry(cnt));
		}
		//if(h == 5) for(int i = 1;i <= cnt;i++) cout << qry(i) - qry(i - 1) << ' ';
		//cout << "\n";
		int l = cnt - k + 1;
		int r = cnt;
		int f = qry(cnt) - qry(l - 1);
		if(f == 0)
		{
			l = cnt + 1;
		}
		else
		{
			while(l < r)
			{
				int mid = l + r + 1 >> 1;
				if(qry(cnt) - qry(mid - 1) == f) l = mid;
				else r = mid - 1;
			}
		}
		int d = l - (cnt - k + 1);
		if(l != cnt + 1) upd(l,-1);
		l = 1;
		r = cnt - k + 1;
		f = qry(cnt - k + 1);
		while(l < r)
		{
			int mid = l + r >> 1;
			if(qry(mid) == f) r = mid;
			else l = mid + 1;
		}
		upd(l,-1);
		upd(l + d,1);
		if(!qry(1))
		{
			mx++;
			upd(1,1);
		}
		/*cout << mx << '\n';
		for(int i = 1;i <= cnt;i++) cout << qry(i) - qry(i - 1) << ' ';
		cout << "\n\n";
		*/
	}
	for(int i = 1;i <= cnt;i++)
	{
		mx -= qry(i) - qry(i - 1);
		ans += (mx * (mx - 1)) / 2;
	}
	rc(ans);
	return 0;
}

Compilation message (stderr)

sails.cpp:4:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
 # pragma GCC optimization ("unroll-loops")
 
sails.cpp: In function 'int32_t main()':
sails.cpp:120:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid = l + r + 1 >> 1;
               ~~~~~~^~~
sails.cpp:132:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    int mid = l + r >> 1;
              ~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 5 / 5
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10
• Subtask 11: 10 / 10