Submission #1770812

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Source Code Expand

#include <algorithm>
#include <cstdio>
const int N=100005;
int a[3][N],p[N],n;
bool u[N],inv[2],flip[2];
bool check(){
	for (int i=1;i<=n;i++){
		if (a[1][i]%3!=2) return 0;
		if (abs(a[0][i]-a[1][i])!=1 || abs(a[2][i]-a[1][i])!=1) return 0;
		if (((a[1][i]+1)/3-i)&1) return 0;
		p[i]=(a[1][i]+1)/3;
		flip[i&1]^=(a[0][i]>a[1][i]);
	}
	for (int i=1;i<=n;i++)
	if (!u[i])
		for (int j=p[i];j!=i;u[j]=1,j=p[j]) inv[i&1]^=1;
	return inv[0]==flip[1] && inv[1]==flip[0];
}
int main(){
	scanf("%d\n",&n);
	for (int i=0;i<3;i++)
		for (int j=1;j<=n;j++) scanf("%d",&a[i][j]);
	if (check()) printf("Yes\n");
		else printf("No\n");
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:20:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d\n",&n);
                  ^
./Main.cpp:22:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   for (int j=1;j<=n;j++) scanf("%d",&a[i][j]);
                                              ^

Judge Result