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2023

高精度模板

+  
Learn +/ +Competitive Programming
define N 1e5 struct bign { int len; int v[N]; // 赋值 bign=bign bign operator = (char* s) { len=strlen(s); memset(v,0,sizeof(v)); for(int i=0;i<len;i++) v[i]=s[len-i-1]-'0'; return *this; } //赋值 bign=int bign operator = (int x) { char s[N]; sprintf(s,"%d",x); return *this=s; } // 高精加 bign operator + (const bign &b) const { bign c; memset(c.

树形DP

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Learn +/ +Competitive Programming
二叉苹果树 思路 $dp[u][j表示节点u留下j条边的最大价值，每一次决策只有三种情况：剪左子树，剪右子树，两个都不剪 剪左边：dp[u][j]=dp[rson][j−1]+v[rson]dp[u][j]=dp[rson][j−1]+v[rson]，同理，剪右边：dp[u][j]=dp[lson][j−1]+v[lson]dp[u][j]=dp[lson][j−1]+v[lson] 两边都不剪：dp[u][j]=dp[lson][j]+dp[rson][k−j−2]dp[u][j]=dp[lson][j]+dp[rson][k−j−2] 代码：记忆化搜索 int f[N][N]; bool t[N][N]; int dp(int u,int k) { if(t[u][k]) return f[u][k]; t[u][k]=1; if(!

随机数基本使用方法

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Learn +/ +Competitive Programming
基本公式： 要取得[a,b)的随机整数，使用(rand() % (b-a))+ a; 要取得[a,b]的随机整数，使用(rand() % (b-a+1))+ a; 要取得(a,b]的随机整数，使用(rand() % (b-a))+ a + 1; 通用公式:a + rand() % n；其中的a是起始值，n是整数的范围。 要取得a到b之间的随机整数，另一种表示：a + (int)b * rand() / (RAND_MAX + 1)。 要取得0～1之间的浮点数，可以使用rand() / double(RAND_MAX)。