var array, encoded, value, accum, i, j, k, l;
 
// Example data
array=[[0,1,-1,-2,-2,0,-1,2],
[0,-1,-1,2,-1,0,2,-1],
[-2,0,-1,2,2,2,2,0],
[-1,1,-2,-2,-1,2,1,-2],
[0,2,-2,0,-2,1,1,2],
[0,0,-1,-1,0,-1,-2,1],
[0,-1,0,-2,-1,-2,-1,1],
[-2,2,-1,2,0,0,2,1],
[2,2,-2,-1,-1,1,-2,-1],
[-1,1,1,-1,1,-1,-1,-2],
[0,0,1,-2,2,2,-2,-2],
[-2,-2,-2,-1,-2,-1,2,-1],
[0,1,-2,1,1,2,1,-1],
[2,-2,-1,2,1,-2,2,-1],
[0,-1,2,-1,0,-2,1,2],
[0,2,-1,-2,0,-2,-2,0],
[2,0,-2,-2,-2,2,0,2],
[-1,-1,-1,1,-2,1,-1,-1],
[-2,2,1,0,-2,-2,-1,1],
[0,0,2,0,0,1,1,0],
[1,1,1,2,-1,2,-1,2],
[1,1,1,2,-2,1,-1,-2],
[2,-1,-2,0,0,1,-1,0],
[-2,-2,1,-1,-1,0,-1,-1],
[-2,1,-2,0,2,2,1,2],
[-2,1,0,1,0,0,0,2],
[-1,-1,-2,-2,-2,-2,-1,2],
[0,2,-2,2,0,0,0,-2],
[2,2,-2,2,1,1,2,2],
[1,-2,-1,-1,0,2,1,-2],
[-2,2,1,1,0,0,-1,1],
[-1,-1,2,-2,1,-1,-2,-1],
[2,2,-2,2,-2,-1,2,1],
[0,-1,2,0,-2,-1,2,-1],
[0,1,0,2,0,-1,1,-2],
[2,-2,-1,-1,-2,1,0,1],
[-1,2,0,2,2,-2,-2,1],
[1,0,0,1,0,0,2,2],
[1,1,2,-2,-2,1,-1,-2],
[-1,-2,2,-2,-2,-1,-1,0],
[-1,1,-1,2,-1,1,-1,-2],
[-1,2,-2,0,0,-1,-2,-2],
[-2,0,0,0,2,-2,-1,0],
[1,-2,2,2,-2,-1,0,2],
[1,-2,0,1,-2,-1,-2,1],
[0,2,-2,2,-1,1,1,-2],
[2,-2,-1,-1,-2,-2,1,-2],
[1,2,-1,1,0,0,2,0],
[1,-1,1,0,-1,-2,1,-2],
[-1,1,-2,-1,0,0,0,2],
[0,-1,-2,2,-1,-1,2,1],
[2,-2,2,0,1,1,-1,-1],
[2,-1,-2,2,-1,-1,0,0],
[-1,1,-1,-2,1,1,2,2],
[1,2,-1,0,-2,-1,-1,0],
[1,1,-1,-1,2,1,-2,0],
[0,0,2,-1,-1,1,1,1],
[0,-1,0,-2,2,2,0,-2],
[-1,2,-1,1,0,0,2,2],
[0,1,2,2,-2,2,1,-1],
[2,-1,0,-2,-2,1,-2,-2],
[-2,-1,2,1,-2,-2,1,2],
[-1,-2,-2,0,-1,-1,-2,2],
[-1,2,1,0,0,-1,2,0],
[-1,-1,1,1,0,-1,1,0],
[2,1,1,2,-2,1,-1,1],
[-1,-2,2,-2,1,1,-1,-1],
[-1,0,-2,1,2,-2,1,-2],
[0,0,1,-2,-1,-2,-1,-2],
[2,0,1,1,2,2,2,-1],
[-2,0,1,2,-2,-1,-2,2],
[1,0,0,0,-1,1,2,-1],
[1,2,-1,0,-2,-2,0,1],
[2,0,2,0,1,2,-1,2],
[1,2,-1,-1,0,0,0,-1],
[-1,2,2,2,-2,2,0,0],
[-1,0,2,0,0,-2,-1,0],
[-1,0,2,2,1,1,2,0],
[1,0,1,-2,-1,2,0,-1],
[-1,1,-1,0,-2,2,2,1],
[0,0,-2,2,2,-1,1,-1]];
 
// Per problem statement, some entries are known to be zero,
// but we don't know which, so this is a placeholder.
function mustBeZero(i, j) { return false; }
 
accum = 0;
k = 1;
l = 0;
// Using a Uint32Array where supported might be better.
// 50 is ceil(9*9*8/13) since we don't know any fixed zeros in this example
encoded = new Array(50);
for (i = 0; i !== 81; ++i) {
    for (j = 0; j !== 8; ++j) {
        if (mustBeZero(i, j))
            continue;
        value = array[i][j] + 2;
        accum += k*value;
        k *= 5;
        if (k !== 1220703125) // 5^13
            continue;
        encoded[l] = accum;
        accum = 0;
        ++l;
        k = 1;
    }
}
if (k !== 1) {
    encoded[l] = accum;
    ++l;
}
print(encoded.join(",\n") + ";\n");
 
// Now we reconstruct the original data from this.
array = null; // forget original input
l = 0;
k = 0;
for (i = 0; i !== 81; ++i) {
    array = []; // one row only
    for (j = 0; j !== 8; ++j) {
        if (mustBeZero(i, j))
            continue;
        if (k === 0) {
            accum = encoded[l];
            ++l;
            k = 13;
        }
        value = (accum % 5);
        accum = (accum - value)/5;
        --k;
        array.push(value - 2);
    }
    print(array.join(","));
}
 

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