Submission #225295

#	Time	Username	Problem	Language	Result	Execution time	Memory
225295		cgiosy	XOR (IZhO12_xor)	C++17	0 / 100	5 ms	384 KiB

xor

#include <bits/stdc++.h>
using namespace std;

struct iii { int l, r, k; };
int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	int N, M, K=0, m=0, id=1;
	cin>>N>>M;
	vector<iii> T((N+1)*31, {0, 0, INT_MAX});
	for(int i=0, x=0; i<N;) {
		for(int p=1, d=31; d--;) {
			auto&[l,r,k]=T[p];
			if(x&1<<d) p=r=r?:++id;
			else p=l=l?:++id;
			T[p].k=min(T[p].k, i);
		}

		int j=++i, t;
		cin>>t; x^=t; t=0;
		for(int p=1, d=31; d-- && p;) {
			auto[l,r,k]=T[p];
			int a=x&1<<d, b=M&1<<d;
			if(!b) j=min(j, T[a?l:r].k);
			p=a^b ? r : l;
			t^=a^b;
			if(t>=M) { j=min(j, T[p].k); break; }
		}
		if(m<i-j) m=i-j, K=j+1;
	}
	cout<<K<<' '<<m;
}

Compilation message (stderr)

xor.cpp: In function 'int main()':
xor.cpp:12:15: warning: unused variable 'k' [-Wunused-variable]
    auto&[l,r,k]=T[p];
               ^
xor.cpp:21:14: warning: unused variable 'k' [-Wunused-variable]
    auto[l,r,k]=T[p];
              ^

• Subtask 1: 0 / 100