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euler1.c
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euler1.c
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#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
int main(){
int t;
scanf("%d",&t);
int a[t];
for(int a0 = 0; a0 < t; a0++){
scanf("%d",&a[a0]);
}
long long int sum=0,sum1=0,sum2=0;
for(int i=0;i<t;i++)
{ sum=0;
if(a[i]%3==0 && a[i]>=0)
{
sum=(a[i]/3);
sum=sum-1;
}
else
{ sum=(a[i]/3);
}
sum=((3*sum))*(sum+1);
sum=sum/2;
sum1=0;
if(a[i]%5==0 && a[i]>0)
{
sum1=(a[i]/5);
sum1=sum1-1;
}
else
{ sum1=(a[i]/5);
}
sum1=((5*sum1))*(sum1+1);
sum1=sum1/2;
sum2=0;
if(a[i]%15==0 && a[i]>0)
{
sum2=(a[i]/15);
sum2=sum2-1;
}
else
{ sum2=(a[i]/15);
}
sum2=((15*sum2))*(sum2+1);
sum2=sum2/2;
sum=sum+sum1-sum2;
printf("%lld\n",sum);
}
return 0;
}
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
int main(){
int t;
scanf("%d",&t);
int a[t];
for(int a0 = 0; a0 < t; a0++){
scanf("%d",&a[a0]);
}
long long int sum=0,sum1=0,sum2=0;
for(int i=0;i<t;i++)
{ sum=0;
if(a[i]%3==0 && a[i]>=0)
{
sum=(a[i]/3);
sum=sum-1;
}
else
{ sum=(a[i]/3);
}
sum=((3*sum))*(sum+1);
sum=sum/2;
sum1=0;
if(a[i]%5==0 && a[i]>0)
{
sum1=(a[i]/5);
sum1=sum1-1;
}
else
{ sum1=(a[i]/5);
}
sum1=((5*sum1))*(sum1+1);
sum1=sum1/2;
sum2=0;
if(a[i]%15==0 && a[i]>0)
{
sum2=(a[i]/15);
sum2=sum2-1;
}
else
{ sum2=(a[i]/15);
}
sum2=((15*sum2))*(sum2+1);
sum2=sum2/2;
sum=sum+sum1-sum2;
printf("%lld\n",sum);
}
return 0;
}