Another solution would be to use a map(or a dictionary in python, AFAIK) where each key would follow this rule: sum - list[i];
for (let i = 0; i < len; i++) { const k = sum-list[i]; if (map.has(k)) console.log(k, map.get(k)) else map.set(k, list[i]); }
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Another solution would be to use a map(or a dictionary in python, AFAIK) where each key would follow this rule: sum - list[i];