Submission #446758

#	Time	Username	Problem	Language	Result	Execution time	Memory
446758		Khizri	XORanges (eJOI19_xoranges)	C++17	0 / 100	109 ms	2120 KiB

xoranges

#include <cstdio>
#include <algorithm>
#include <cmath>
using namespace std;
//------------------------------DEFINE------------------------------
//******************************************************************
#define IOS ios_base::sync_with_stdio(false); cin.tie(0),cout.tie(0)
#define ll long long
#define pb push_back		 
#define F first																 
#define S second 															 
#define INF 1e18
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pii pair<int,int>
#define pll pair<ll,ll>
#define OK cout<<"Ok"<<endl;
#define MOD (ll)(1e9+7)
#define endl "\n"
//******************************************************************
//----------------------------FUNCTION------------------------------
//******************************************************************
ll gcd(ll a,ll b){
	if(a>b) swap(a,b);
	if(a==0) return a+b;
	return gcd(b%a,a);
}
ll lcm(ll a,ll b){
	return a/gcd(a,b)*b;
}
bool is_prime(ll n){
	ll k=sqrt(n);
	if(n==2) return true;
	if(n<2||n%2==0||k*k==n) return false;
	for(int i=3;i<=k;i+=2){
		if(n%i==0){
			return false;
		}
	}
	return true;
}
//*****************************************************************
//--------------------------MAIN-CODE------------------------------
const int mxn=2e5+5;
ll t=1,n,arr[mxn],q,dp[mxn];
void solve(){
	scanf("%lld %lld",&n,&q);
	for(int i=1;i<=n;i++){
		scanf("%lld",&arr[i]);
	}
	ll ans=0;
	for(int i=1;i<=n;i++){
		if(((i)*(n-i+1))%2==1){
			ans^=arr[i];
			dp[i]=dp[i-1]+ans;
		}
	}
	while(q--){
		ll k,l,r;
		scanf("%lld %lld %lld",&k,&l,&r);
		if(k==1){
			arr[l]=r;
		}
		else{
			printf("%lld\n",dp[r]-dp[l-1]);
		}
	}
}
int main(){
	//IOS;
	//cin>>t;
	while(t--){
		solve();
	}
	return 0;
}

Compilation message (stderr)

xoranges.cpp: In function 'void solve()':
xoranges.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |  scanf("%lld %lld",&n,&q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~
xoranges.cpp:49:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |   scanf("%lld",&arr[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~
xoranges.cpp:60:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |   scanf("%lld %lld %lld",&k,&l,&r);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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