delete pics to save space

history_source/信息学奥赛一本通/2.5.2.cpp

@@ -0,0 +1,41 @@
+#include<cstdio>
+#include<cmath>
+#include<cstdlib>
+int x[26];
+int ans=0;
+bool check(int y)
+{
+	for(int i=1;i<y;i++)
+	    if(x[i]==x[y]||abs(i-y)==abs(x[i]-x[y])) return 0;
+	return 1;
+}
+void print(int n)
+{
+	printf("No. %d\n",ans);
+	for(int i=1;i<=n;i++)
+	{
+		for(int j=1;j<=n;j++)
+		{
+			if(x[i]==j) printf("1 ");
+			else printf("0 ");
+		}
+		printf("\n");
+	}
+}
+void dfs(int y,int n)
+{
+	if(y>n){ans++;print(n);return;}
+	for(int i=1;i<=n;i++)
+	{
+		x[y]=i;
+		if(check(y)) dfs(y+1,n);
+	}
+}
+int main()
+{
+	int n;
+	n=8;
+	dfs(1,n);
+	return 0;
+}
+