Submission #1085505

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085505		Sunbae	XOR (IZhO12_xor)	C++17	0 / 100	1 ms	348 KiB

xor

#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5, inf = 1e9 + 7;
int qs[N], cp[N<<1], m = 0, bit[N<<1];
int pos(int x){ return upper_bound(cp, cp+m, x) - cp;}
void upd(int i, int val){ for(; i<=m; i+=i&-i) bit[i] = min(bit[i], val);}
int qry(int i){ int res = inf; for(; i; i-=i&-i) res = min(res, bit[i]); return res;}
signed main(){
	int n, x; scanf("%d %d", &n, &x);
	if(!x){ printf("1 %d", n); return 0;}
	for(int i = 0; i<n; ++i){
		scanf("%d", qs+i);
		if(i) qs[i] ^= qs[i-1];
		cp[m++] = qs[i]; 
		cp[m++] = (x ^ qs[i]);
	}
	sort(cp, cp+m); m = unique(cp, cp+m) - cp;
	fill(bit, bit+m+1, inf);
	int mx_len = 0, mn_st = n;
	for(int i = 0; i<n; ++i){
		int Qry = qry(pos(qs[i]));
		if(Qry < inf){
			int len = i - Qry, st = Qry + 1;
			if(len > mx_len) mx_len = len, mn_st = st;
			else if(len == mx_len && st < mn_st) mn_st = st;
		}
		upd(pos(x ^ qs[i]), i);
	}
	++mn_st;
	printf("%d %d", mn_st, mx_len);
}

Compilation message (stderr)

xor.cpp: In function 'int main()':
xor.cpp:9:17: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  int n, x; scanf("%d %d", &n, &x);
      |            ~~~~~^~~~~~~~~~~~~~~~~
xor.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |   scanf("%d", qs+i);
      |   ~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 100