delete pics to save space

2.11039.cpp

@@ -0,0 +1,45 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=500005;
+int T,n,x;
+int a[2][maxn],cnt[2];
+int cal(int d)//d +first
+{
+	if(cnt[d]==0) return 0;
+	int res=1,now=a[d][0],p[2],np;
+	p[d]=1;p[d^1]=0;
+	while(true)
+	{
+		np=(res&1)^d;
+		if(p[np]>=cnt[np]) break;
+		while(p[np]<cnt[np]&&now>=a[np][p[np]])
+			p[np]++;
+		if(p[np]>=cnt[np]) break;
+		res++;
+		now=a[np][p[np]];
+		p[np]++;
+	}
+	return res;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&T);
+	while(T-->0)
+	{
+		scanf("%d",&n);
+		cnt[0]=cnt[1]=0;
+		for(int i=0;i<n;i++)
+		{
+			scanf("%d",&x);
+			a[x>0][cnt[x>0]++]=(x>0?x:-x);
+		}
+		sort(a[0],a[0]+cnt[0]);
+		sort(a[1],a[1]+cnt[1]);
+		printf("%d\n",max(cal(1),cal(0)));
+	}
+	return 0;
+}