Submission #1280279

#	Time	Username	Problem	Language	Result	Execution time	Memory
1280279		Kerim	XORanges (eJOI19_xoranges)	C++17	100 / 100	68 ms	4568 KiB

xoranges

#include "bits/stdc++.h"

using namespace std;
const int N = 2e5+5;
int F[2][N], a[N];
void upd(int t, int x, int v){
	for (;x < N; x += x&(-x))
		F[t][x] ^= v;
}
int get(int t, int x){
	int res = 0;
	for (;x;x-=x&(-x))
		res ^= F[t][x];
	return res;
}
int tap(int t, int l, int r){
	return get(t, r) ^ get(t, l-1);
}
int main(){
	// freopen("file.in", "r", stdin);
	int n, q;
	scanf("%d%d", &n, &q);
	for (int i = 1; i <= n; i++){
		int x;
		scanf("%d", &x);
		a[i] = x;
		upd(i%2, i, x);
	}
	while (q--){
		int t;
		scanf("%d", &t);
		if (t == 1){
			int p, v;
			scanf("%d%d", &p, &v);
			upd(p%2, p, a[p]^v);
			a[p] = v;
		}
		else{
			int l, r;
			scanf("%d%d", &l, &r);
			if ((r-l)%2 == 0)
				printf("%d\n", tap(l%2, l, r));
			else
				puts("0");
		}
	}
}

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:22:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         scanf("%d%d", &n, &q);
      |         ~~~~~^~~~~~~~~~~~~~~~
xoranges.cpp:25:22: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |                 scanf("%d", &x);
      |                 ~~~~~^~~~~~~~~~
xoranges.cpp:31:22: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |                 scanf("%d", &t);
      |                 ~~~~~^~~~~~~~~~
xoranges.cpp:34:30: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |                         scanf("%d%d", &p, &v);
      |                         ~~~~~^~~~~~~~~~~~~~~~
xoranges.cpp:40:30: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |                         scanf("%d%d", &l, &r);
      |                         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 25 / 25
• Subtask 4: 20 / 20
• Subtask 5: 25 / 25