delete pics to save space

history_source/信息学奥赛一本通/2.7.7.cpp

@@ -0,0 +1,32 @@
+#include<cstdio>
+#define abs(a) ((a)<0?(-(a)):(a))
+int main()
+{
+	int n,m,ri,le,mi;
+	scanf("%d",&n);
+	long long a[n],x,ans;
+	for(int i=0;i<n;i++) scanf("%lld",a+i);
+	scanf("%d",&m);
+	while(m--)
+	{
+		scanf("%lld",&x);
+		ri=n;
+		le=0;
+		while(le<ri)
+		{
+			mi=(le+ri)/2;
+			if(a[mi]==x) 
+			{
+				le=mi;
+				break;
+			}
+			if(a[mi]>x) ri=mi;
+			if(a[mi]<x) le=mi+1;
+		}
+		if(le>=n) ans=a[n-1];
+		else if(le==0) ans=a[0];
+		else ans=(abs(a[le-1]-x)<=abs(a[le]-x))?a[le-1]:a[le];
+		printf("%d\n",ans);
+	}
+	return 0;
+}