Submission #739928

#	Time	Username	Problem	Language	Result	Execution time	Memory
739928		pera	XORanges (eJOI19_xoranges)	C++14	0 / 100	635 ms	47608 KiB

xoranges

#include<bits/stdc++.h>

using namespace std;

#define pb push_back
#define ll long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

#define int ll

const ll mod = 1e9 + 7 , N = 2e5 + 1;

int n , q;
vector<int> a(N);
vector<vector<int>> t(4 * N , vector<int>(2));

int comb(int u , int v){
	return u ^ v;
}

void up(int v , int l , int r , int p , int val , int c){
	if(l == r){
		t[v][c] = val;
	}else{
		int m = (l + r) / 2;
		if(p <= m) up(v * 2 , l , m , p , val , c);
		else up(v * 2 + 1 , m + 1,  r , p , val , c);
		t[v][c] = comb(t[v * 2][c] , t[v * 2 + 1][c]);
	}
}

int xr(int v , int l , int r , int L , int R , int c){
	if(l > r || l > R || r < L) return 0;
	if(l >= L && r <= R){
		return t[v][c];
	}
	int m = (l + r) / 2;
	return comb(xr(v * 2 , l , m , L , R , c) , xr(v * 2 + 1 , m + 1 , r , L , R , c)); 
}

main(){
	ios::sync_with_stdio(0);
	cin.tie(0),cout.tie(0);
	cin >> n >> q;
	for(int i = 1;i <= n;i ++){
		cin >> a[i];
		up(1 , 1 , n , (i + 1) / 2 , a[i] , i & 1);
	}
//	cout << xr(1 , 1 , n , 2 , 2 , 0) << endl;
	while(q --){
		int T , x , y;cin >> T >> x >> y;
		if(T == 1){
			up(1 , 1 , n , (x + 1) / 2 , y , x & 1);
		}else{
			int lo = 0 , ro = 0 , le = 0 , re = 0;
			if(x & 1) lo = (x + 1) / 2;
			else lo = x / 2 + 1;
			if(y & 1) ro = (y + 1) / 2;
			else ro = y / 2;
			le = (x + 1) / 2 , re = y / 2;
			int X1 = xr(1 , 1 , n , lo , ro , 1) , X2 = xr(1 , 1 , n  , le , re , 0) , X = 0;
			/*cout << X1 << " " << X2 << endl;
			cout << "---------------" << endl;
			cout << lo << " " << ro << endl;
			cout << le << " " << re << endl;
			cout << "---------------" << endl;*/
			cout << ((y - x + 1) & 1 == x & 1 ? X1 : X2) << endl;
		}
	}
}

Compilation message (stderr)

xoranges.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   42 | main(){
      | ^~~~
xoranges.cpp: In function 'int main()':
xoranges.cpp:68:29: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   68 |    cout << ((y - x + 1) & 1 == x & 1 ? X1 : X2) << endl;
      |                           ~~^~~~
xoranges.cpp:62:79: warning: unused variable 'X' [-Wunused-variable]
   62 |    int X1 = xr(1 , 1 , n , lo , ro , 1) , X2 = xr(1 , 1 , n  , le , re , 0) , X = 0;
      |                                                                               ^

• Subtask 1: 0 / 12
• Subtask 2: 0 / 18
• Subtask 3: 0 / 25
• Subtask 4: 0 / 20
• Subtask 5: 0 / 25