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  1. import java.io.BufferedReader;
  2. import java.io.InputStreamReader;
  3.  
  4. public class Main {
  5.     private static long[] t;
  6.     private static long[]codes;
  7.     private static final long prime = 61;
  8.     private static long[] pows;
  9.     private static void build (int v, int tl, int tr) {
  10.         if (tl == tr){
  11.             t[v] = (codes[tl] * pows[tl - 1]);
  12.         }
  13.         else {
  14.             int tm = (tl + tr) / 2;
  15.             build (2 * v, tl, tm);
  16.             build (2 * v + 1, tm + 1, tr);
  17.             t[v] = (t[2 * v] + t[2 * v + 1]);
  18.         }
  19.     }
  20.  
  21.     private static long sum (int v, int tl, int tr, int l, int r) {
  22.         if (l > r){
  23.             return 0;
  24.         }
  25.         if (l == tl && r == tr)
  26.             return t[v];
  27.         int tm = (tl + tr) / 2;
  28.         return sum (2 * v, tl, tm, l, Math.min(r, tm))
  29.                 + sum (2 * v + 1, tm + 1, tr, Math.max(l, tm + 1), r);
  30.     }
  31.  
  32.     private static void update (int v, int tl, int tr, int pos, long newVal) {
  33.         if (tl == tr)
  34.             t[v] = (newVal * pows[pos - 1]);
  35.         else {
  36.             int tm = (tl + tr) / 2;
  37.             if (pos <= tm)
  38.                 update (v*2, tl, tm, pos, newVal);
  39.             else
  40.                 update (2 * v + 1, tm + 1, tr, pos, newVal);
  41.             t[v] = (t[2 * v] + t[2 * v + 1]);
  42.         }
  43.     }
  44.     public static void main(String[] args) throws Exception{
  45.         BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
  46.         String[] params = bufferedReader.readLine().split(" ");
  47.         int n = Integer.parseInt(params[0]);
  48.         codes = new long[n + 1];
  49.         pows = new long[n + 1];
  50.         t = new long[4 * n];
  51.         int k = Integer.parseInt(params[1]);
  52.         String a = bufferedReader.readLine();
  53.         for (int i = 1; i <= n; i++) {
  54.             codes[i] = a.charAt(i - 1) - 'A' + 1;
  55.         }
  56.         pows[0] = 1;
  57.         for (int i = 1; i <= n; i++) {
  58.             pows[i] = pows[i - 1] * prime;
  59.         }
  60.         build(1, 1, n);
  61.         for (int t = 0; t <k; t++) {
  62.             char q = (char) bufferedReader.read();
  63.             bufferedReader.skip(1);
  64.             if (q == '?') {
  65.                 String[] query = bufferedReader.readLine().split(" ");
  66.                 int i = Integer.parseInt(query[0]);
  67.                 int j = Integer.parseInt(query[1]);
  68.                 int len = Integer.parseInt(query[2]);
  69.                 if (i > j) {
  70.                     int temp = i;
  71.                     i = j;
  72.                     j = temp;
  73.                 }
  74.                 // System.out.println(sum(1, 1, n, i, i + len - 1) * pows[j - i]);
  75.                 // System.out.println( sum(1, 1, n, j, j + len - 1));
  76.                 if(sum(1, 1, n, i, i + len - 1) * pows[j - i] == sum(1, 1, n, j, j + len - 1)){
  77.                     System.out.print("+");
  78.                 }
  79.                 else{
  80.                     System.out.print("-");
  81.                 }
  82.             }
  83.             else if(q == '*') {
  84.                 String[] query = bufferedReader.readLine().split(" ");
  85.                 int temp = Integer.parseInt(query[0]);
  86.                 char c = query[1].charAt(0);
  87.                 update(1, 1, n, temp, c - 'A' + 1);
  88.             }
  89.         }
  90.     }
  91. }
Runtime error #stdin #stdout #stderr 0.04s 2184192KB
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Standard input is empty
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Standard output is empty
stderr
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Exception in thread "main" java.lang.NullPointerException
	at Main.main(Main.java:46)
https://ideone.com/N630ju
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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