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413.java
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413.java
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sample 0 ms submission
class Solution {
public int numberOfArithmeticSlices(int[] A) {
int n = A.length, res = 0, count = 0;
for (int i = 1; i < n - 1; i++) {
if (A[i] - A[i - 1] == A[i + 1] - A[i]) res += ++count;
else count = 0;
}
return res;
}
}
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sample 35560 kb submission
class Solution {
public int numberOfArithmeticSlices(int[] A) {
if(A == null || A.length < 3) {
return 0;
}
int n = A.length;
int[] dp = new int[n];
dp[0] = 0;
dp[1] = 0;
for(int i = 2; i < n; i++){
if(A[i] - A[i - 1] == A[i - 1] - A[i - 2]){
dp[i] = dp[i - 1] + 1;
}
}
return IntStream.of(dp).sum();
}
}
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