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Submission #48550

# Submission time Handle Problem Language Result Execution time Memory
48550 2018-05-15T22:46:11 Z Pajaraja XOR Sum (info1cup17_xorsum) C++17
100 / 100
 935 ms 37680 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<31;j++)
	{
		int b=(1<<j),t=0;
		long long bc=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=0;
		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) k++;
		if((k/2+bc*(n-bc))%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 396 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 532 ms 8536 KB Output is correct
2 Correct 504 ms 8536 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 532 ms 8536 KB Output is correct
2 Correct 504 ms 8536 KB Output is correct
3 Correct 786 ms 8536 KB Output is correct
4 Correct 669 ms 8536 KB Output is correct

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 6 ms 396 KB Output is correct
3 Correct 104 ms 8536 KB Output is correct
4 Correct 96 ms 8536 KB Output is correct

Subtask #5
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 376 KB Output is correct
2 Correct 6 ms 396 KB Output is correct
3 Correct 532 ms 8536 KB Output is correct
4 Correct 504 ms 8536 KB Output is correct
5 Correct 786 ms 8536 KB Output is correct
6 Correct 669 ms 8536 KB Output is correct
7 Correct 104 ms 8536 KB Output is correct
8 Correct 96 ms 8536 KB Output is correct
9 Correct 935 ms 18952 KB Output is correct
10 Correct 920 ms 28288 KB Output is correct
11 Correct 891 ms 37680 KB Output is correct