小测验-循环

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#include <iostream>
using namespace std;
int main()
{
	int s, a, n;
	s= 0;
	a= 1;
	cin >> n;
	do
	{
	  s+= 1;
	  a-= 2;
	}
	while ( a != n );
	cout << s << endl;
	return(0);
}

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#include <iostream>
using namespace std;
int main(){
    int i=0,n,sum=0;
    cin>>n;
    do{
       i++;
       sum+=i;
    }while(sum<n);
    cout<<i<<endl;
return 0;
}

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#include<iostream>
using namespace std;

int main()
{
    int i,n,m,ans;
    cin>>n>>m;
    i=n;
    ans=0;
    while(i<=m){
       ans+=i;
       i++;
    }
    cout<<ans<<endl;
    return 0;
}

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#include <iostream> 
using namespace std;
int main(){
	int a, b, u, i, num;
	cin>>a>>b>>u; 
	num = 0;
	for(i = a; i <= b; i++) 
   		if((i % u) == 0)num++;

	cout<<num<<endl; 
return 0;
}

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#include <iostream>
using namespace std;
int main() { 
 int a, b, u, v, i, num;  
 cin>>a>>b>>u>>v; 
 num = 0; 
 for (i = a; i <= b; i++) 
if (((i % u) == 0) || ((i % v) == 0)) 
   num++; 
 printf("%d\n", num); 
 return 0; 
} 

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#include <iostream>
using namespace std;

int main(){
	int a, b, i, tot, c1, c2;
	cin>>a>>b;
	tot = 0;
	for ( i = a; i <= b; i++ ){
		c1=i/10;
		c2=i%10;
		if ( (c1 + c2) % 3 == 0 )
			tot++;
	}
	cout<<tot;
	return 0;
}