Sum of XOR Functions 类似的形式还有 \sum_{i=1}^{n}\sum_{j=i}^n\bigoplus_{k=i}^{j}a_k(j-i+1)\\ 即转化为 \sum_{i=1}^{n}\sum_{j=i}^nb_j\oplus b_{i-1}(j-(i-1))\\ 只需再维护一个权值数组 w[2] 即可 代码 #include<bits/stdc++.h> using namespace std;...
-falign-functions,-fstrict-aliasing,-fschedule-insns2,-ftree-tail-merge,inline-functions,-fschedule-insns,-freorder-blocks,-funroll-loops,-fthread-jumps,-fcrossjumping,-fcaller-saves,-fdevirtualize,-falign-labels,-falign-loops,-falign-jumps,unroll-loops,-fsched-spec,-ffast-math,Ofast,...
2.遍历每一位,找出能使他对答案有贡献的区间个数,再乘上区间长度 细节 由于有求模运算,所以减法可能会出现负数,通过加一个模数解决 code #include<bits/stdc++.h>usingnamespacestd;#definell long longconstll mod=998244353; ll a[300005]; ll sum[2]={0}; ll cnt[2]={0};inlinevoidread(ll &x){...
voidsolve(){intn, ans =0;cin >> n;vector<int>a(n +1),b(n +1);for(inti =1; i <= n; i++) {cin >> a[i];}for(intt =0; t <=30; t++) {for(inti =1; i <= n; i++) {b[i] = (a[i] >> t) &1;}intx =0, res =0;// the number of 1sintcnt[2] = ...
异或，是一种位操作符，记为XOR。异或和之和，指的是通过拆分位操作，简化复杂运算。对于形如的表达式，利用拆位技巧，设，则原式转化为。由于位运算的独立性，当第k位为1时，区间有贡献。对于二进制每一位，维护一个0/1前缀和数组，表示考虑前i个二进制第k位上为1的数量。通过枚举每个i，将...
Simple utility to calculate and compare hashes of multiple files checksumhash-functionsmd5sha1sha256md5sumripemd160sha1sumsha256sumcalculate-hashcompare-hash UpdatedDec 20, 2023 C# boyter/hashit A cross platform tool to compute hashes of files quickly. Similar to hashdeep. ...
Implementation of GOST R 34.11-94, GOST R 34.11-2012 (STRIBOG-256/512), SHA, SHA2 hash functions and hash based algorithms: HMAC, PBKDF, SSHA. cryptographymd5pbkdf2hmacgosthashing-algorithmpbkdf1hashsumssha1sumsha256sumsha512sumsha224sumstriboggost94 ...
Public Member Functions Item_sum_xor (const POS &pos, Item *item_par, PT_window *w) Item_sum_xor (THD *thd, Item_sum_xor *item) const char * func_name () const override Item * copy_or_same (THD *thd) override Public Member Functions inherited from Item_sum_bit Public Member Func...
However, since ESOPs use exclusive-OR (XOR) instead of OR operators they can be exponentially more compact than sum-of-product (SOP) expressions for important classes of functions. In XOR heavy logic, ESOP expressions allow us to find optimizations that SOPs simply do not have access to.Luca...
BIT_OR and BIT_XOR UDF_SUM_FUNC, // user defined functions GROUP_CONCAT_FUNC, // GROUP_CONCAT or GROUP_CONCAT DISTINCT JSON_AGG_FUNC, // JSON_ARRAYAGG and JSON_OBJECTAGG ROW_NUMBER_FUNC, // Window functions RANK_FUNC, DENSE_RANK_FUNC, CUME_DIST_FUNC, PERCENT_RANK_FUNC, NTILE_FUNC...