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Validate FastSort stdin bounds #85

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Validate FastSort stdin bounds #85

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60 changes: 38 additions & 22 deletions src/main/java/algorithms/sprint3/FastSort.java
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,9 @@

public class FastSort {

private static final int MAX_PARTICIPANTS = 100_000;
private static final int MAX_LOGIN_LENGTH = 256;

/*
Принцип работы алгоритма:
1) Считываем n участников в массив.
Expand Down Expand Up @@ -140,51 +143,64 @@ private int read() throws IOException {
return buffer[ptr++];
}

int nextInt() throws IOException {
int c;
do {
c = read();
if (c == -1) {
throw new EOFException();
}
} while (c <= ' ');

int nextInt(String fieldName, int minValue, int maxValue) throws IOException {
int c = nextNonWhitespace();
int value = 0;

while (c > ' ') {
value = value * 10 + c - '0';
if (c < '0' || c > '9') {
throw new IOException("Invalid integer token for " + fieldName);
}
int digit = c - '0';
if (value > (maxValue - digit) / 10) {
throw new IOException("Integer token for " + fieldName + " exceeds " + maxValue);
}
value = value * 10 + digit;
c = read();
}

if (value < minValue) {
throw new IOException("Integer token for " + fieldName + " is below " + minValue);
}
return value;
}

String next() throws IOException {
String next(int maxLength) throws IOException {
int c = nextNonWhitespace();
StringBuilder sb = new StringBuilder(Math.min(maxLength, 16));

while (c > ' ') {
if (sb.length() == maxLength) {
throw new IOException("Token length exceeds " + maxLength);
}
sb.append((char) c);
c = read();
}
return sb.toString();
}

private int nextNonWhitespace() throws IOException {
int c;
do {
c = read();
if (c == -1) {
throw new EOFException();
}
} while (c <= ' ');

StringBuilder sb = new StringBuilder();
while (c > ' ') {
sb.append((char) c);
c = read();
}
return sb.toString();
return c;
}
}

private static void run() throws Exception {
FastIn in = new FastIn(System.in);

int n = in.nextInt(); // n — количество участников
int n = in.nextInt("participant count", 0, MAX_PARTICIPANTS); // n — количество участников
Participant[] participants = new Participant[n];

for (int i = 0; i < n; i++) {
String login = in.next();
int solved = in.nextInt();
int penalty = in.nextInt();
String login = in.next(MAX_LOGIN_LENGTH);
int solved = in.nextInt("solved", 0, Integer.MAX_VALUE);
int penalty = in.nextInt("penalty", 0, Integer.MAX_VALUE);
participants[i] = new Participant(login, solved, penalty);
}

Expand Down