long long function( int n ) {
long long res = 0;
for( int i = 1; i <= n; i++ )
for( int j = i+1; j <= n; j++ )
res+=lcm(i,j);
return res;
}
N<=5*10^6 and TestCases<=25000.. TimeLimit=5s
Can anyone give hints to solve this ?
Thanks in advance !
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