Submission #1308048

#	Time	Username	Problem	Language	Result	Execution time	Memory
1308048		Nonoze	Pairs (IOI07_pairs)	C++17	30 / 100	1999 ms	13296 KiB

pairs

/*
*	Author: Nonoze
*	Created: Sunday 04/01/2026
*/
#include <bits/stdc++.h>
using namespace std;

#ifndef DEBUG
	#define dbg(...)
#endif

// #define cout cerr << "OUT: "
#define endl '\n'
#define endlfl '\n' << flush
#define quit(x) return (void)(cout << x << endl)

template<typename T> void read(T& x) { cin >> x; }
template<typename T1, typename T2> void read(pair<T1, T2>& p) { read(p.first), read(p.second); }
template<typename T> void read(vector<T>& v) { for (auto& x : v) read(x); }
template<typename T1, typename T2> void read(T1& x, T2& y) { read(x), read(y); }
template<typename T1, typename T2, typename T3> void read(T1& x, T2& y, T3& z) { read(x), read(y), read(z); }
template<typename T1, typename T2, typename T3, typename T4> void read(T1& x, T2& y, T3& z, T4& zz) { read(x), read(y), read(z), read(zz); }
template<typename T> void print(vector<T>& v) { for (auto& x : v) cout << x << ' '; cout << endl; }

#define sz(x) (int)(x.size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define make_unique(v) sort(all(v)), v.erase(unique(all(v)), (v).end())
#define pb push_back
#define mp(a, b) make_pair(a, b)
#define fi first
#define se second
#define cmin(a, b) a = min(a, b)
#define cmax(a, b) a = max(a, b)
#define YES cout << "YES" << endl
#define NO cout << "NO" << endl
#define QYES quit("YES")
#define QNO quit("NO")

#define int long long
#define double long double
const int inf = numeric_limits<int>::max() / 4;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MOD = 1e9+7, LOG=20;



void solve();

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int tt=1;
	// cin >> tt;
	while(tt--) solve();
	return 0;
}




template<class T>
struct segtree {
	vector<T> st;
	int n;
	T idElement;

	segtree() {}

	segtree(int nn, T idEl, vector<T> creation={}) {
		n=nn, idElement=idEl;
		st.resize(n*2, idElement);
		if (!creation.empty()) {
			for (int i=0; i<n; i++) st[i+n]=creation[i];
			build();
		}
	}

	void build() {
		for (int i=n-1; i>0; i--) st[i] = combine(st[i<<1], st[i<<1|1]);
	}
	
	void update(int p, T val) {
		for (st[p += n] += val; p > 1; p >>= 1) st[p>>1] = combine(st[p], st[p^1]);
	}

	T query(int l, int r) {
		T resl = idElement, resr = idElement;
		r++;
		for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
			if (l&1) resl = combine(resl, st[l++]);
			if (r&1) resr = combine(st[--r], resr);
		}
		return combine(resl, resr);
	}

	T combine(T l, T r) {
		T ans=l+r;
		return ans;
	}
};



struct grid3d {
	int x, y, z;
};

struct grid2d {
	int x, y, a, b;
};

int b, n, k, m;


int sub1() {
	vector<int> a(n);
	for (auto &u: a) cin >> u;
	sort(all(a));
	int pos=1, ans=0;
	for (int i=0; i<n; i++) {
		pos=max(pos, i+1);
		while (pos<n && a[pos]-a[i]<=k) pos++;
		pos--;
		ans+=pos-i;
	}
	return ans;
}


int sub2() {
	vector<grid2d> a(n);
	for (auto &u: a) cin >> u.x >> u.y, u.x--, u.y--, u.a=u.x+u.y, u.b=u.x-u.y+m;
	/*
	dist(a, b) = max({
		(a.x-b.x)+(a.y-b.y),
		(a.x-b.x)+(b.y-a.y),
		(b.x-a.x)+(a.y-b.y),
		(b.x-a.x)+(b.y-a.y)
	})

	a.c=a.x+a.y, a.d=a.x-a.y
	dist(a, b) = max({
		(a.c - b.c),
		(a.d - b.d),
		(b.d - a.d),
		(b.c - a.c)
	})
	*/
	vector<vector<grid2d>> buckets(2*m+1); for (auto &u: a) buckets[u.a].pb(u);
	segtree<int> st(2*m+1, 0);
	int ans=0;
	for (int i=0; i<=2*m; i++) {
		for (auto &u: buckets[i]) st.update(u.b, 1);
		if (i>k) for (auto &u: buckets[i-k-1]) st.update(u.b, -1);
		for (auto &u: buckets[i]) {
			int low=max(0LL, u.b - k);
			int high=min(2*m, u.b + k);
			int res=st.query(low, high);
			ans+=res-1;
		}
	}
	return ans;
}


int sub3() {
	vector<grid3d> a(n);
	for (auto &u: a) {
		cin >> u.x >> u.y >> u.z;
		u.x--, u.y--, u.z--;
	}
	if (n<=10000) {
		int ans=0;
		for (int i=0; i<n; i++) {
			for (int j=i+1; j<n; j++) {
				if (abs(a[i].x-a[j].x)
					+abs(a[i].y-a[j].y)
					+abs(a[i].z-a[j].z)<=k) ans++;
			}
		}
		cout << ans << endl;
	} else {
		int ans=0;
		int comp=0;
		vector<vector<vector<int>>> tab(m+1, vector<vector<int>>(m+1, vector<int>(m+1, 0)));
		for (int i=0; i<n; i++) tab[a[i].x][a[i].y][a[i].z]++;
		for (int i=0; i<n; i++) {
			int x=a[i].x, y=a[i].y, z=a[i].z;
			for (int a=max(0LL, x-k); a<=min(m, x+k); a++) {
				int restant=k-abs(x-a);
				for (int b=max(0LL, y-restant); b<=min(m, y+restant); b++) {
					int res=restant-abs(y-b);
					for (int c=max(0LL, z-res); c<=min(m, z+res); c++) {
						if (tab[a][b][c]>1) comp++;
						ans+=tab[a][b][c];
					}
				}
			}
			ans--;
		}
		cout << ans/2 << endl;
	}
}


void solve() {
	cin >> b >> n >> k >> m;
	cout << (b==1 ? sub1() : (b==2 ? sub2() : sub3())) << endl;
	return;
}

Compilation message (stderr)

pairs.cpp: In function 'long long int sub3()':
pairs.cpp:204:1: warning: no return statement in function returning non-void [-Wreturn-type]
  204 | }
      | ^

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 0 / 7
• Subtask 7: 0 / 7
• Subtask 8: 0 / 8
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• Subtask 10: 0 / 10
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• Subtask 13: 0 / 10