Submission #634256

#	Time	Username	Problem	Language	Result	Execution time	Memory
634256		lovrot	Segments (IZhO18_segments)	C++11	7 / 100	5068 ms	2992 KiB

segments

#include <bits/stdc++.h> 

#define pii pair<int, int> 
#define X first
#define Y second
#define pb push_back

using namespace std; 

const int SQR = 450;
const int N = 4 * 1e5 + 10;

int n, xr, lastans, pos[N];
int b_cnt; //num. of buckets
int cnt; //num of diff. intervals
bool ban[N];
pii intv[N];

vector<vector<int>> lft, rgt;
vector<pii> bkt, bkt2, add;
vector<int> vl, vr, rem;

int intersect(pii a, pii b){ 
	if(b.X > a.Y || a.X > b.Y) return 0;
	return min(a.Y, b.Y) - max(a.X, b.X) + 1;
}

void bucket(){ 
	// for(int x : rem) ban[x] = true;

	// sort(add.begin(), add.end());

	// int p1 = 0;
	// int p2 = 0;
	// lft.clear();
	// rgt.clear();
	// while(p1 < add.size() || p2 < bkt.size()){ 
	// 	if(p1 < add.size() && p2 < bkt.size()){ 
	// 		if(add[p1].X < bkt[p2].X){
	// 			bkt2.pb(add[p1]);
	// 			p1++;
	// 		} else { 
	// 			bkt2.pb(bkt[p2]);
	// 			p2++;
	// 		}
	// 	} else if(p1 < add.size()){ 
	// 		bkt2.pb(add[p1]);
	// 		p2++;
	// 	} else { 
	// 		bkt2.pb(bkt[p2]);
	// 		p2++;
	// 	}
	// }
	// bkt.clear();
	// for(pii x : bkt2){ 
	// 	if(!ban[x.Y])
	// 		bkt.pb(x);
	// }
	// bkt2.clear();

	// for(pii x : bkt){ 
	// 	vl.pb(intv[x.Y].X);
	// 	vr.pb(intv[x.Y].Y);

	// 	if(vl.size() >= SQR){ 
	// 		sort(vl.begin(), vl.end());
	// 		sort(vr.begin(), vr.end());
	// 		lft.pb(vl);
	// 		rgt.pb(vr);
	// 		vl.clear();
	// 		vr.clear();
	// 	}
	// }

	// if(!vl.empty()){ 
	// 	sort(vl.begin(), vl.end());
	// 	sort(vr.begin(), vr.end());
	// 	lft.pb(vl);
	// 	rgt.pb(vr);
	// 	vl.clear();
	// 	vr.clear();	
	// }

	// for(int x : rem) ban[x] = false;
	// rem.clear();
	// add.clear();	
	// b_cnt = lft.size();
}

int main(){ 
	for(int i = 0; i < N; i++) pos[i] = i / SQR;

	scanf("%d%d", &n, &xr);
	
	for(int i = 0; i < n; i++){ 		
		int t;
		cin >> t;
		if(t == 1){ 	
			int l, r;
			scanf("%d%d", &l, &r);
			l = l ^ (xr * lastans);
			r = r ^ (xr * lastans);
			if(l > r) swap(l, r);

			intv[++cnt] = {l, r};
			add.pb({r - l + 1, cnt});
		} else if(t == 2){ 
			int ind;
			scanf("%d", &ind);
			rem.pb(ind);
		} else { 
			int l, r, k, ans = 0;
			scanf("%d%d%d", &l, &r, &k);
			
			l = l ^ (xr * lastans);
			r = r ^ (xr * lastans);
			if(l > r) swap(l, r);

			for(int x : rem){
				// cout << intv[x].X << " " << intv[x].Y << " " << l << " " << r << ": " << intersect(intv[x], {l, r}) << " -\n";
				if(intersect(intv[x], {l, r}) >= k) ans--;
			}
			for(pii x : add){
				// cout << intv[x.Y].X << " " << intv[x.Y].Y << " " << l << " " << r << ": " << intersect(intv[x.Y], {l, r}) << " +\n";
				if(intersect(intv[x.Y], {l, r}) >= k) ans++;
			}

			int lo = 0, hi = bkt.size();
			while(hi - lo > 1){ 
				int mi = (lo + hi) / 2;
				if(bkt[mi].X < k)
					lo = mi;
				else 
					hi = mi;
			}
			int b = pos[hi];
			while(hi < bkt.size() && pos[hi] == b){ 
				if(intersect(intv[bkt[hi].Y], {l, r}) >= k) ans++;
				hi++;
			}
			b++;
			for(b; b < b_cnt; b++){ 
				ans += lft[b].size(); 
				ans -= upper_bound(rgt[b].begin(), rgt[b].end(), l + k) - rgt[b].begin();
				ans -= lft[b].end() - upper_bound(lft[b].begin(), lft[b].end(), r - k);
			}
			cout << ans << "\n";
			lastans = ans;
		}

		if(add.size() + rem.size() >= SQR){ 
			bucket();
		}
	}

	return 0; 
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:137:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  137 |    while(hi < bkt.size() && pos[hi] == b){
      |          ~~~^~~~~~~~~~~~
segments.cpp:142:8: warning: statement has no effect [-Wunused-value]
  142 |    for(b; b < b_cnt; b++){
      |        ^
segments.cpp:93:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |  scanf("%d%d", &n, &xr);
      |  ~~~~~^~~~~~~~~~~~~~~~~
segments.cpp:100:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  100 |    scanf("%d%d", &l, &r);
      |    ~~~~~^~~~~~~~~~~~~~~~
segments.cpp:109:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |    scanf("%d", &ind);
      |    ~~~~~^~~~~~~~~~~~
segments.cpp:113:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  113 |    scanf("%d%d%d", &l, &r, &k);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 15
• Subtask 3: 0 / 16
• Subtask 4: 0 / 17
• Subtask 5: 0 / 20
• Subtask 6: 0 / 25