uva 11584 Partitioning by Palindromes 回文+dp
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dp[i]表示以i结尾的串最少可以分割的串数。
状态方程:dp[i] = min{ dp[j]+1, 串[j,i]是回文串&&1<=j<=i }
#include<stdio.h>#include<iostream>#include<math.h>#include<string.h>#include<iomanip>#include<stdlib.h>#include<ctype.h>#include<algorithm>#include<deque>#include<functional>#include<iterator>#include<vector>#include<list>#include<map>#include<queue>#include<set>#include<stack>#define CPY(A, B) memcpy(A, B, sizeof(A))typedef long long LL;typedef unsigned long long uLL;const int MOD = int (1e9) + 7;const int INF = 0x3f3f3f3f;const LL INFF = 0x3f3f3f3f3f3f3f3fLL;const double EPS = 1e-9;const double OO = 1e20;const double PI = acos (-1.0);const int dx[] = {-1, 0, 1, 0};const int dy[] = {0, 1, 0, -1};using namespace std;const int maxn = 1010;char str[maxn];int dp[maxn];bool isPalind(int l,int r){ while(l<r){ if(str[l]!=str[r])return false; ++l;--r; } return true;}int main() { int T;scanf("%d",&T); while(T--){ scanf("%s",str+1); int len=strlen(str+1); memset(dp,0,sizeof(dp)); for(int i=1;i<=len;i++){ dp[i]=i+1; for(int j=1;j<=i;j++)if(isPalind(j,i)){//这里竟然漏了isPalind函数,呃WA一次 dp[i]=min(dp[i],dp[j-1]+1); } } printf("%d\n",dp[len]); } return 0;}
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