int i = 0;
int j = 0;
double sum = 0;
while (i < doc['keys'].length && j < params.keys.length) {
if (doc['keys'][i] == params.keys[j]) {
sum += doc['values'][i] * params.values[j];
++i;
++j;
continue;
}
if (doc['keys'][i] > params.keys[j]) {
++j;
}
else {
++i;
}
}
double norm0 = 0;
for (i=0; i<params.values.length; i++){
norm0 += params.values[i] * params.values[i];
}
double norm1 = 0;
for (i=0; i<doc['values'].length; i++){
norm1 += doc['values'][i] * doc['values'][i];
}
double norm = norm0 * norm1;
return sum/norm;
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