Submission #4262401

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Source Code Expand

#include<bits/stdc++.h>
const int maxn=1e5+7;
struct node{
	int index;
	int v;
}a[maxn];
bool cmp(const node &x,const node &y)
{
	if(x.v!=y.v)
	return x.v<y.v;
	return 0;
}
int main()
{
	int n,cnt=0;
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	scanf("%d",&a[i].v),a[i].index=i;
	std::sort(a+1,a+n+1,cmp);
	for(int i=1;i<=n;i++)
	  if((a[i].index&1)!=(i&1))
	    cnt++;
	printf("%d",cnt>>1);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:16:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:18:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&a[i].v),a[i].index=i;
                                  ^

Judge Result