Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.
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C (gcc)C (gcc), 67 bytes

f(n,m){double a,b;for(;n<=m;a+=n,b+=pow(n++,2));return pow(a,2)-b;}

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C (gcc), 67 bytes

f(n,m){double a,b;for(;n<=m;a+=n,b+=pow(n++,2));return pow(a,2)-b;}

C (gcc), 67 bytes

f(n,m){double a,b;for(;n<=m;a+=n,b+=pow(n++,2));return pow(a,2)-b;}

Try it online!

1
source | link

C (gcc), 67 bytes

f(n,m){double a,b;for(;n<=m;a+=n,b+=pow(n++,2));return pow(a,2)-b;}