link:http://acm.hdu.edu.cn/showproblem.php?pid=4632
refer to:
o(╯□╰)o……明明百度找的题解，然后后来就找不到我看的那份了，这位哥们对不住了……
1 #include <iostream> 2 #include <cstdio> 3 #include <cstdlib> 4 #include <cstring> 5 #include <cmath> 6 #include <cctype> 7 #include <algorithm> 8 #include <queue> 9 #include <deque> 10 #include <queue> 11 #include <list> 12 #include <map> 13 #include <set> 14 #include <vector> 15 #include <utility> 16 #include <functional> 17 #include <fstream> 18 #include <iomanip> 19 #include <sstream> 20 #include <numeric> 21 #include <cassert> 22 #include <ctime> 23 #include <iterator> 24 const int INF = 0x3f3f3f3f; 25 const int dir[8][2] = {{-1,0},{1,0},{0,-1},{0,1},{-1,-1},{-1,1},{1,-1},{1,1}}; 26 using namespace std; 27 char a[1111]; 28 int dp[1111][1111]; 29 const int MOD = 10007; 30 int main(void) 31 { 32 #ifndef ONLINE_JUDGE 33 freopen("in.txt", "r", stdin); 34 #endif // ONLINE_JUDGE 35 ios::sync_with_stdio(false); 36 int t; cin>>t; 37 for (int k = 1; k <= t; ++k) 38 { 39 cin>>a; int len = strlen(a); 40 memset(dp, 0, sizeof(dp)); 41 for (int i = 0; i < len; ++i) for (int j = 0; j < len; ++j) 42 if (i==j) dp[i][j] = 1; 43 for (int i = 0; i < len; ++i) 44 { 45 for (int j = 0; i+j < len; ++j) 46 { 47 if (a[i+j] == a[j]) 48 { 49 dp[j][i+j] = dp[j][i+j-1] + dp[j+1][i+j] + 1; 50 } 51 else 52 { 53 dp[j][i+j] = dp[j+1][i+j] + dp[j][i+j-1] - dp[j+1][i+j-1]; 54 } 55 dp[j][i+j] = (dp[j][i+j] + MOD)%MOD; 56 } 57 } 58 cout<< "Case "<<k<< ": "<<dp[0][len-1]<<endl; 59 } 60 return 0; 61 } 62 /* 63 模拟一下第二个样例 aaaaa 就懂了 64 */
o(╯□╰)o
永远感觉规划是一个很神奇的东西，比如这道。想明白了就感觉很神奇~