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int outPos = 0, previous = 0;
for (int inPos = 0; inPos < n; inPos++) {
...
    }
    compressed[outPos++] = delta;
}

int outPos = 0, previous = 0;
for (int outPos = 0; outPos < n; outPos++) {
...
    }
    uncompressed[outPos] = previous;
}