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lines changed Original file line number Diff line number Diff line change 1+ ```
2+ import java.io.*;
3+ import java.util.StringTokenizer;
4+
5+ public class Main {
6+ private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
7+ private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
8+ private static final int MOD = (int) 1e9+7;
9+ private static int[][] dp;
10+ private static int s;
11+ private static String str;
12+
13+ public static void main(String[] args) throws IOException {
14+ init();
15+ DP();
16+
17+ bw.write(dp[str.length()][s] + "\n");
18+ bw.flush();
19+ bw.close();
20+ br.close();
21+ }
22+
23+ private static void init() throws IOException {
24+ s = Integer.parseInt(br.readLine());
25+ str = br.readLine();
26+
27+ dp = new int[str.length()+1][s+1];
28+
29+ dp[0][0] = 1;
30+ for (int i = 1; i <= str.length(); i++) {
31+ dp[i][0] = 1;
32+ }
33+ for (int i = 1; i <= s && i <= 25; i++) {
34+ dp[1][i] = 1;
35+ }
36+ }
37+
38+ private static void DP() {
39+ for (int i = 2; i <= str.length(); i++) {
40+ for (int j = 1; j <= s; j++) {
41+ if (j >= 26) {
42+ int val = (dp[i][j-1] + dp[i-1][j]) % MOD;
43+ dp[i][j] = (val - dp[i-1][j-26] + MOD) % MOD;
44+ } else {
45+ dp[i][j] = (dp[i][j-1] + dp[i-1][j]) % MOD;
46+ }
47+ }
48+ }
49+ }
50+ }
51+ ```
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