Submission #67876

#	Time	Username	Problem	Language	Result	Execution time	Memory
67876		tempytemptemp	XOR Sum (info1cup17_xorsum)	C++14	7 / 100	1680 ms	4592 KiB

xorsum

/*
  We found Despacito 5 during contest (not clickbait)
*/
#include	<iostream>
#include	<cstdio>
#include	<vector>
#include 	<set>
#include	<map>
#include	<queue>
#include	<stack>
#include	<algorithm>
#include	<cstring>
#include	<cfloat>
#include	<cmath>
#include	<cassert>
#include	<locale>
#include	<string>
#include	<bitset>
#include	<functional>
#include	<climits>
#include	<iomanip>
using namespace std;

#define read(x)     freopen(x,"r",stdin)
#define write(x)    freopen(x,"w",stdout)
#define cl(a,b)	    memset(a,b,sizeof(a))
#define all(x)      x.begin(),x.end()
#define rall(x)     x.rbegin(),x.rend()
#define ll          long long
#define ld          long double
#define vec         vector
#define vi          vec<int>
#define heap        priority_queue
#define res         reserve
#define pb          push_back
#define f(x,y,z)    for(int x=(y); x<(z); x++)
#define fd(x,y,z)   for(int x=(y); x>=(z); x--)
#define fit(x,y)    for(auto x: y)
#define srt(x)      sort(all(x))
#define rsrt(x)     sort(rall(x))
#define make_unique(x) sort(all((x))); (x).resize(unique(all((x))) - (x).begin())
#define pii         pair<int,ll>
#define ppi         pair<pii,int>
#define pip         pair<int,pii>
#define mp          make_pair
#define f1          first
#define s2          second
#define cdbg(x)     cerr<<#x<<" = "<<x<<",\t";
#define cdbl        cerr<<"\n----------\n";
#define pow2(x)     ((x)*(x))
#define edist(x1, y1, x2, y2) (sqrt((pow2(x1-x2)+pow2(y1-y2))))
#define mdist(x1, y1, x2, y2) (abs((x1)-(x2))+abs((y1)-(y2)))
#define y1          FullSensei
#define mid         ((ss+se)>>1)
#define left        (si<<1)
#define right       ((si<<1)+1)
#define pi          3.141592653589793
#define popcount    __builtin_popcount
#define spc			' '
#define endl		'\n'
#define lb          lower_bound
bool checkbit(int x,int y){return (x&(1<<y));}
int setbit(int x,int y){return (x^(1<<y));}
const int dirs[4][2]={{1,0},{0,1},{-1,0},{0,-1}};
const int mod=1e9+7;
const int p1=805306457;
const int p2=1610612741;
const int INF=1e9;
const int N=1e6;
const int V=4e3;
vi buff, v;
int n;

int main(){
	scanf("%d",&n);
	v.res(N+3);
	buff.res(V+3);
	f(i,1,n+1){
		int temp;
		scanf("%d",&temp);
		//assert(n<=4e3 || temp<=V);
		buff.pb(temp);
	}
	srt(buff);
	ll factor=0;
	int cnt=1;
	for(int i=0; i<buff.size(); i++){
		if(i+1<buff.size()){
			if(buff[i]!=buff[i+1]){
				if(cnt==1){
					v.pb(buff[i]);
					continue;
				}
				if(cnt%2==1){
					v.pb(buff[i]);
				}
				ll temp=cnt;
				temp=temp*(cnt-1)/2+temp;
				if(temp%2==1){
					factor^=((ll) buff[i]*2);
				}
				cnt=1;
			}
			else{
				cnt++;
			}
		}
		else{
			if(cnt==1){
				v.pb(buff[i]);
				continue;
			}
			if(cnt%2==1){
				v.pb(buff[i]);
			}
			ll temp=cnt;
			temp=temp*(cnt-1)/2+temp;
			if(temp%2==1){
				factor^=((ll) buff[i]*2);
			}
			cnt=1;
		}
	}
	ll ans=factor;
	f(i,0,v.size()){
		f(j,i,v.size()){
			ll temp = (ll) v[i] + v[j];
//			cerr<<v[i]<<spc<<v[j]<<spc<<temp<<spc<<ans<<endl;
			ans ^= temp;
		}
	}
	cout<<ans<<endl;
	return 0;
}

Compilation message (stderr)

xorsum.cpp: In function 'int main()':
xorsum.cpp:87:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<buff.size(); i++){
               ~^~~~~~~~~~~~
xorsum.cpp:88:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(i+1<buff.size()){
      ~~~^~~~~~~~~~~~
xorsum.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define f(x,y,z)    for(int x=(y); x<(z); x++)
                                     ^
xorsum.cpp:125:2: note: in expansion of macro 'f'
  f(i,0,v.size()){
  ^
xorsum.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define f(x,y,z)    for(int x=(y); x<(z); x++)
                                     ^
xorsum.cpp:126:3: note: in expansion of macro 'f'
   f(j,i,v.size()){
   ^
xorsum.cpp:75:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
xorsum.cpp:80:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&temp);
   ~~~~~^~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 11
• Subtask 3: 0 / 21
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23