Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 28416   Accepted: 10966 Description You are given n closed, integer intervals [ai, bi] and n integers c1, ..., cn. Write a program that: reads the number of intervals, their end points and…

题目:http://poj.org/problem?id=1201 差分约束裸题: 设 s[i] 表示到 i 选了数的个数前缀和: 根据题意,可以建立以下三个限制关系: s[bi] >= s[ai-1] + ci ( 1 <= i <= n) s[i] >= s[i-1] + 0 ( 1 <= i <= mx) s[i-1] >= s[i] + (-1) (1 <= i <= mx) 然后求最长路,可以发现其中的 dis 值不会多余增大,也就满足题意要…

Intervals Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4181    Accepted Submission(s): 1577 Problem Description You are given n closed, integer intervals [ai, bi] and n integers c1, ..., cn.…

Integer Intervals Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 12192   Accepted: 5145 Description An integer interval [a,b], a < b, is a set of all consecutive integers beginning with a and ending with b. Write a program that: finds t…

Intervals Time Limit: 10 Seconds      Memory Limit: 32768 KB You are given n closed, integer intervals [ai, bi] and n integers c1, ..., cn. Write a program that: > reads the number of intervals, their endpoints and integers c1, ..., cn from the stand…

题目:http://poj.org/problem?id=1201 题意:给定n组数据,每组有ai,bi,ci,要求在区间[ai,bi]内至少找ci个数, 并使得找的数字组成的数组Z的长度最小. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cstdlib> using namespace std; <<;…

题目:http://poj.org/problem?id=1201 差分约束裸套路:前缀和 本题可以不把源点向每个点连一条0的边,可以直接把0点作为源点.这样会快许多! 可能是因为 i-1 向 i 都连着一条0的边. 别忘了约束条件不仅有s[ i ] - s[ i-1 ] >= 0,还有s[ i ] - s[ i - 1] <= 1! 别忘了s的范围不是n而是mx! #include<iostream> #include<cstdio> #include<cstr…

题意:       有一条直线,直线上做多有50000个点,然后给你组关系 a b c表明a-b之间最少有c个点,问直线上最少多少个点. 思路:        a-b最少有c个点可以想象a到b+1的距离是大于等于c的,还有一个隐含条件就是 0<=S[i] - S[i-1]<=1,差分约束的题目记住找隐含条件很重要,这样也就是一共三个条件,建边求最上路,记住查分约束求短要用最长路,求最长要用最短路,最长路的建边是 a      ,b       c S[i-1] ,S[i]    0 S[i]…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud Intervals Time Limit: 10 Seconds      Memory Limit: 32768 KB You are given n closed, integer intervals [ai, bi] and n integers c1, ..., cn. Write a program that: > reads the number of interva…

Description You are given n closed, integer intervals [ai, bi] and n integers c1, ..., cn. Write a program that: reads the number of intervals, their end points and integers c1, ..., cn from the standard input, computes the minimal size of a set Z of…