Cheapest Palindrome
Time limit:2000ms Memory limit:65536kb 64bit IO Format:%lld %lluSubmit
Status
DescriptionKeeping track of the cows can be a tricky tasks so farmer John has installed a system to automate it. He has installed in each cow a electronic ID tagged that the system would read as the cows pass by a scanner. Each ID tag "s contents are currently a single string with length M (1≤m≤2,000) characters drawn from a alphabet of N (1≤n≤26) differe
Cheapest Palindrome
Time Limit: 2000MS
Memory Limit: 65536K
Total Submissions: 6186
Accepted: 3014
DescriptionKeeping track of all the cows can is a tricky task so Farmer John have installed a system to automate it. He has installed on each cow an electronic ID tag that the system would read as the cows pass by a scanner. Each ID tag ' s contents is currently a single string with length m
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Cheapest Palindrome
Time Limit: 2000MS
Memory Limit: 65536K
Total Submissions: 6013
Accepted: 2933
DescriptionKeeping track of all the cows can is a tricky task so Farmer John have installed a system to automate it. He has installed on each cow an electronic ID tag that the system would read as the cows pass by a scanner. Each ID tag ' s contents is currently a single string with length m
Test Instructions: An alphabetic sequence of length m, consisting of n letters, each with two costs: ① delete the letter; ② Add the letter. Ask the minimum cost of turning this sequence into a palindrome sequence. the f[I [j] represents the minimum cost of I-J this section into a palindrome string. when sequence s[i] = = s[J], no cost is required: f[I [j] = f[i + 1][j-1];otherwise:①-> plus or minus the I-letter, f[i + 1 [j] + w[s[I]];②-> plus or minus the J-letter, f[I [j-1] + w[s[j]];(because a
Cheapest Palindrome
Topic Links:http://poj.org/problem?id=3280Test instructionsGiven a string of only lowercase letters, you can add or delete some letters (both add and delete cost and vary) to change the string to the minimum cost of a palindrome string.ExercisesSet DP[I][J] is the minimum cost of changing the interval [i,j] into a palindrome, then two cases① obvious, when S[i]==s[j], dp[i][j]=dp[i+1][j-1]② when S[i]!=s[j], Dp[i][j] has four pos
Cheapest Palindrome
Time Limit: 2000MS
Memory Limit: 65536K
Total Submissions: 8643
Accepted: 4189
DescriptionKeeping track of all the cows can is a tricky task so Farmer John have installed a system to automate it. He has installed on each cow an electronic ID tag that the system would read as the cows pass by a scanner. Each ID tag ' s contents is currently a single string with length m
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POJ 3280 Cheapest Palindrome (DP), pojpalindromeZookeeper
Description
Keeping track of all the cows can be a tricky task so Farmer John has installed a system to automatic it. he has installed on each cow an electronic ID tag that the system will read as the cows pass by a packet. each ID tag's contents are currently a single string with lengthM(1 ≤M≤ 2,000) characters drawn from an alphabetN(1 ≤N≤26) different symbols (namely, the lower-case roman al
POJ 3280 Cheapest Palindrome dynamic programming method, pojpalindrome
Description
Keeping track of all the cows can be a tricky task so Farmer John has installed a system to automatic it. he has installed on each cow an electronic ID tag that the system will read as the cows pass by a packet. each ID tag's contents are currently a single string with lengthM(1 ≤M≤ 2,000) characters drawn from an alphabetN(1 ≤N≤26) different symbols (namely, the lower
Test instructions: Give you a M-bit string, where the character is one of the given n lowercase letters, and then the cost of adding or removing the letter in the stringNot the same. It is the minimum cost of the string to be a palindrome after adding a delete operation.Idea: Consider D[i][j] as the minimum cost of a palindrome string I to J.such as xx.....yy, if x = = Y, obviously d[i][j] = d[i+1][j-1];if x! = Y, then there are 4 scenarios: Delete x, add an x after Y, delete y, and add y before
"The main topic"Gives a string that can delete or add some characters, each of which consumes value. Ask at least how much value, can make a string into a palindrome.IdeasIn fact the value of deleting or adding characters only needs to keep the smaller one. Assuming that you are currently converting (j,i) to a literal, it has the following three scenarios:(1) Add or remove at the end of a character that is the same as the beginning, f[j][i-1]+cost[s[i]-' a ';(2) Adding or deleting a character at
given name tag.Sample Input3 4ABCBA 1100b 700c 200 800Sample Output900HintIf We insert an "a" in the end to get "ABCBA", the cost would is 1000. If we delete the "a" on the beginning-get "BCB", the cost would is 1100. If we insert "BCB" at the begining of the string, the cost would are + + + + =, which is the minimum.SourceUsaco Open GoldA look at this problem is always felt to be a string processing problems, in fact, it is necessary to model dynamic programming method.Dynamic programming meth
entry point of the console application. //#include"stdafx.h"#include"iostream"using namespacestd;intMain () {intb//define the number of books purchased intM,n; inti; Doublesum=0; cout"Please enter the number of books you need to purchase:"Endl; CIN>>b; M=b/5; N=b%5; I=n+5; if(i!=8) { Switch(n) { Case 0: Sum=m* +*0.75; Break; Case 1: Sum=m* +*0.75+8; Break; Case 2: Sum=m* +*0.75+ -*0.95; Break; Case 3: Sum=m* +*0.75+ -*0.9; Break; Case 4: Sum=m* +*0.75+ +*0.8; Break; } }
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cost-to-change the given name tag.Sample Input3 4ABCBA 1100b 700c 200 800Sample Output900Test instructions: A series of alphabetic sequences. The addition or deletion of a character makes the sequence a palindrome, and it costs to add and subtract, asking for the least amount.Set DP[I][J] for the cost from I to J.Dp[i][j] = min (Dp[i+1][j]+cost[i], dp[i][j-1]+cost[j]); (A[i]! = A[j])DP[I][J] = Dp[i+1][j-1] (a[i] = a[j])Cost[] is the small value of each character deletion or addition, because d
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DP[I][J] Indicates the cost of processing I to J, if s[i] = = S[j] Do not need to process, otherwise processing s[i] or s[j],For a character ch, plus ch or delete ch, the effect is the same for interval transfer, taking min.#include #include#includestring>#include#include#include#include#include#include#includeSet>#includeusing namespacestd;Const intSigma_size = -, MAXM = 2e3+5;CharS[MAXM];intAdd[sigma_size], del[sigma_size];intCost[sigma_size];intDP[MAXM][MAXM];//#define LOCALintMain () {#ifdef
() {intb//define the number of books purchased intM,n; inti; Doublesum=0; cout"Please enter the number of books you need to purchase:"Endl; CIN>>b; M=b/5; N=b%5; I=n+5; if(i!=8) { Switch(n) { Case 0: Sum=m* +*0.75; Break; Case 1: Sum=m* +*0.75+8; Break; Case 2: Sum=m* +*0.75+ -*0.95; Break; Case 3: Sum=m* +*0.75+ -*0.9; Break; Case 4: Sum=m* +*0.75+ +*0.8; Break; } } Elsesum= (M-1)* -+4*8*0.8*2; cout"Reader Purchase""The lowest price for this book is:"Endl; coutE
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