思路:x绝对小于根号n,再由s(x,m)可以缩小范围.1e9十六进制大约算出每位和相加100左右.这种题直接判断范围再暴力. #include<stdio.h> #include<string.h> #include<algorithm> #include<cmath> #include<cstdlib> #include<iostream> #define LL long long using namespace std; int…
Description 题目描述 You are given an polynomial of x consisting of only addition marks, multiplication marks, brackets, single digit numbers, and of course the letter x. For example, a valid polynomial would be: (1+x)*(1+x*x+x+5)+1*x*x. You are required…
Description 题目描述 Recently, you have found your interest in string theory. Here is an interesting question about strings. You are given a string S of length n consisting of the first k lowercase letters. You are required to find two non-empty substrin…