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Submission #48545

# Submission time Handle Problem Language Result Execution time Memory
48545 2018-05-15T22:10:38 Z Pajaraja XOR Sum (info1cup17_xorsum) C++17
39 / 100
 765 ms 25616 KB 
#include <bits/stdc++.h>
using namespace std;
int a[1000007],c[1000007];
int main()
{
	int n,sol=0;
	scanf("%d",&n);
	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
	for(int j=0;j<=30;j++)
	{
		int b=(1<<j),bc=0,t=0;
		if(j) for(int i=1;i<=n;i++) if((a[i] | (1<<(j-1)))!=a[i]) c[++t]=a[i];
		if(j) for(int i=1;i<=n;i++) if((a[i] | (1<<(j-1)))==a[i]) c[++t]=a[i];
		if(j) for(int i=1;i<=n;i++) {a[i]=c[i]; c[i]=a[i]%b;} 
		for(int i=1;i<=n;i++) if((a[i] | b) == a[i]) bc++;
		long long k=2*bc*(n-bc);
		int t1=1,t2=n;
		while(t1<=n)
		{
			while(c[t2]+c[t1]>=b) t2--;
			k+=(n-t2);
			t1++;
		}
		for(int i=1;i<=n;i++) if(2*(c[i]%b)>=b) k++;
		if((k/2)%2==1) sol+=b;
	}
	printf("%d",sol);
}

Compilation message

xorsum.cpp: In function 'int main()':
xorsum.cpp:7:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
xorsum.cpp:8:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf("%d",&a[i]);
                        ~~~~~^~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 6 ms 376 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 691 ms 8240 KB Output is correct
2 Correct 571 ms 12068 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 691 ms 8240 KB Output is correct
2 Correct 571 ms 12068 KB Output is correct
3 Correct 765 ms 19256 KB Output is correct
4 Correct 733 ms 25616 KB Output is correct

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 6 ms 376 KB Output is correct
3 Incorrect 100 ms 25616 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 6 ms 376 KB Output is correct
3 Correct 691 ms 8240 KB Output is correct
4 Correct 571 ms 12068 KB Output is correct
5 Correct 765 ms 19256 KB Output is correct
6 Correct 733 ms 25616 KB Output is correct
7 Incorrect 100 ms 25616 KB Output isn't correct
8 Halted 0 ms 0 KB -