题意:给出n组x,y,z.判断是否存在一个id使得id%x1∈(y1,z1),id%x2∈(y2,z2). 析: 设 id/x1=a , id/x2=b ,则 id-a*x1=u;   (1) id-b*x2=v;   (2) (1)-(2)得  一阶不定方程:  bx2-ax1=u-v . 方程可解性为是否存在 (u-v) 是gcd(x1,x2)的整数倍. 那么也就是判断y[x1]-z[x2], z[x1]-y[x2],这就是范围,然后在判断是的时候,如果两个端点能够整除,就返回真,如果两个端…

题目大意: 给定k,找到一个满足的a使任意的x都满足 f(x)=5*x^13+13*x^5+k*a*x 被65整除 推证: f(x) = (5*x^12 + 13 * x^4 + ak) * x 因为x可以任意取 那么不能总是满足 65|x 那么必须是 65 | (5*x^12 + 13 * x^4 + ak) 那么就是说 x^12 / 13 + x^4 / 5 + ak / 65 正好是一个整数 假设能找到满足的a , 那么将 ak / 65 分进x^12 / 13 + x^4 / 5中得到…

http://acm.hdu.edu.cn/showproblem.php?pid=1576 A/B Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3351 Accepted Submission(s): 2545 Problem Description 要求(A/B)%9973,但由于A很大,我们只给出n(n=A%9973)(我们给定的A必…

Romantic Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2385    Accepted Submission(s): 944 Problem Description The Sky is Sprite.The Birds is Fly in the Sky.The Wind is Wonderful.Blew Throw th…

题目链接:pid=2669">http://acm.hdu.edu.cn/showproblem.php?pid=2669 Problem Description The Sky is Sprite. The Birds is Fly in the Sky. The Wind is Wonderful. Blew Throw the Trees Trees are Shaking, Leaves are Falling. Lovers Walk passing, and so are Yo…

链接:HDU - 6409:没有兄弟的舞会 题意: 题解: 求出最大的 l[i] 的最大值 L 和 r[i] 的最大值 R,那么 h 一定在 [L, R] 中.枚举每一个最大值,那么每一个区间的对于答案的贡献就是一个等差数列的和(乘法分配律),将每一个和乘起来就是该最大值的对于答案的贡献.但是相同最大值可能来自于多个区间,如果枚举每一个可能出现最大值的区间,那么会超时,所以需要一个神奇的方法,我也不知道原理是什么,但是数学上就是直接的式子,可以分解出来. #include <bits/stdc+…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4300 Problem Description Clairewd is a member of FBI. After several years concealing in BUPT, she intercepted some important messages and she was preparing for sending it to ykwd. They had agreed that ea…

小C的倍数问题 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 481    Accepted Submission(s): 278 Problem Description 根据小学数学的知识,我们知道一个正整数x是3的倍数的条件是x每一位加起来的和是3的倍数.反之,如果一个数每一位加起来是3的倍数,则这个数肯定是3的倍数. 现在给定进制…

地址:http://acm.hdu.edu.cn/showproblem.php?pid=5768 Lucky7 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Problem Description When ?? was born, seven crows flew in and stopped beside him. In its childhood, ?? had be…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1576 Problem Description 要求(A/B)%9973,但因为A非常大,我们仅仅给出n(n=A%9973)(我们给定的A必能被B整除.且gcd(B,9973) = 1).   Input 数据的第一行是一个T,表示有T组数据. 每组数据有两个数n(0 <= n < 9973)和B(1 <= B <= 10^9). Output 相应每组数据输出(A/B)%9973.  …