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#include <bits/stdc++.h>
using namespace std;
long long n,i,dem,a[10000];
//chuongtrinhcon
bool ktnt(long long n)
{
for (int i=2; i*i<=n; i++)
if (n%i==0) return(false);
return(true);
}
//chuongtrinhchinh
int main()
{
cin>>n;
dem=0;
for (i=1; i<=n; i++)
{
cin>>a[i];
if (a[i]>1 && (ktnt(a[i])==true)) dem++;
}
cout<<dem;
return 0;
}
#include <stdio.h>
int main(){
int n;
scanf("%d",&n);
long t=0; int i,j;
for (i=2; i<=n; i++){
int c=0;
for (j=2; j<i; j++)
if (i%j==0) c++;
if (c==0) t=t+i;
}
printf("%d",t);
return 0;
}
Bài 6:
#include <bits/stdc++.h>
using namespace std;
int main () {
int n;
cin >> n;
int p=n/60;
int s=n%60;
if (p<60) {
if (p<10) {
if (s<10) cout <<"00:0" << p << ":0" << s; else cout <<"00:0" << p << ":" << s;} else
if ((p>=10) and (p<60)) {if (s<10) cout << "00:" << p << ":0" << s;
else cout << "00:" << p << ":" << s;}}
if (p>=60) {
int h = p/60;
p = p%60;
if (h<10) { if (p<10) {
if (s<10) cout << "0" << h << ":" << "0" << p <<":0" <<s;
else cout << "0" << h << ":" << "0" << p <<":" <<s; } else {
if (s<10) cout << "0" << h << ":" << p <<":0" <<s;
else cout << "0" << h << ":" << p <<":" <<s;} } else {
if (p<10) { if (s<10) cout << h << ":" << "0" << p <<":0" <<s;
else cout << h << ":" << "0" << p <<":" <<s; } else {
if (s<10) cout << h << ":" << p <<":0" <<s;
else cout << h << ":" << p <<":" <<s;} } }
return 0;
}
Bài 5:
#include <bits/stdc++.h>
using namespace std;
int main () {
int n;
cin >> n;
int m=n;
int t100 = n/100;
n = n - t100 * 100;
int t50 = n/50;
n = n - t50*50;
int t20 = n/20;
n = n - t20*20;
int t10 = n/10;
n = n - t10*10;
int t5 = n/5;
n = n - t5*5;
int t2 = n/2;
n = n - t2*2;
int t1 = n;
if (m>=100) cout << t100 << " to menh gia 100" << endl;
if (t50!=0) cout << t50<< " to menh gia 50" << endl;
if (t20!=0) cout << t20<< " to menh gia 20" << endl;
if (t10!=0) cout << t10<< " to menh gia 10" << endl;
if (t5!=0) cout << t5<< " to menh gia 5" << endl;
if (t2!=0) cout << t2<< " to menh gia 2" << endl;
if (t1!=0) cout << t50<< " to menh gia 1" << endl;
return 0;
}
