Submission #64309319

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Source Code Expand

#include <bits/stdc++.h>
#define _F(x,y,z) for(int x=y;x<=z;x++)
#define F_(x,z,y) for(int x=z;x>=y;x--)
#define TF(x,y,z) for(int x=head[y],z;x;x=nex[x])

using namespace std;

typedef long long ll;
typedef double dou;
typedef const int ci;
typedef pair<int,int> pii;

ci maxn=2e6+10;

int n,a[maxn],pi[maxn],mp[maxn],t;
int main()
{
	scanf("%d",&t);
	while(t--)
	{
		ll ans=0;
		scanf("%d",&n);
		_F(i,1,2*n+10)
			mp[i]=pi[i]=a[i]=0;
		_F(i,1,2*n)
		{
			scanf("%d",&a[i]);
			if(mp[a[i]])
				pi[i]=mp[a[i]],pi[mp[a[i]]]=i;
			else
				mp[a[i]]=i;
		}
		_F(i,1,2*n)
		{
			if(a[i]==a[i-1]||a[i]==a[i+1]) continue;
			if(a[i]<a[i-1])
			{
				if(abs(pi[i-1]-pi[i])<=1&&abs(pi[i-1]-i+1)>1)
					ans++;
			}
			if(a[i]<a[i+1])
			{
				if(abs(pi[i+1]-pi[i])<=1&&abs(pi[i+1]-i-1)>1)
					ans++;
			}
		}
		printf("%lld\n",ans/2);
	}
	return 0;
}

Submission Info

Compile Error

Main.cpp: In function ‘int main()’:
Main.cpp:18:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   18 |         scanf("%d",&t);
      |         ~~~~~^~~~~~~~~
Main.cpp:22:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   22 |                 scanf("%d",&n);
      |                 ~~~~~^~~~~~~~~
Main.cpp:27:30: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   27 |                         scanf("%d",&a[i]);
      |                         ~~~~~^~~~~~~~~~~~

Judge Result