delete pics to save space

history_source/挑战程序设计竞赛/3.1.1.cpp

@@ -0,0 +1,32 @@
+#include<cstdio>
+int n,k;
+int a[1000005];
+void solve()
+{
+	int l=0,r=n-1,mid;
+	while(l<r)
+	{
+		mid=(l+r)/2;
+		if(a[mid]<k) l=mid+1;
+		else r=mid;
+	}
+	if(a[l]>=k) printf("%d\n",l);
+	else printf("-1");
+}
+void init()
+{
+	scanf("%d",&n);
+	for(int i=0;i<n;i++) scanf("%d",a+i);
+	scanf("%d",&k);
+}
+int main()
+{
+	init();
+	solve();
+	return 0;
+}
+/*
+5
+2 3 3 5 6
+3
+*/