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;

}

#include <bits/stdc++.h>

using namespace std;

long long a,b;

int main()

{

cin>>a>>b;

cout<<a*b;

return 0;

}

#include <iostream>
using namespace std;

int main() {
    float sd, td;
    int muc1 = 1000, muc2 = 1500, muc3 = 2000;

    cin >> sd;

    if (sd <= 50) {
        td = sd * muc1;
    } else if (sd <= 100) {
        td = 50 * muc1 + (sd - 50) * muc2;
    } else {
        td = 50 * muc1 + 50 * muc2 + (sd - 100) * muc3;
    }

    cout << td;

    return 0;
}

#include <bits/stdc++.h>

using namespace std;

int main() {

int n;

cin >> n;

long long t=0;

if (n<=50) cout << n*1000;

if ((n>50) and (n<=100) cout << 50*1000+(n-50)*1500;

if (n>=101) cout << 50*1000+50*1500+(n-100)*2000;

return 0;

}

Bài 1: 

#include <bits/stdc++.h>

using namespace std;

long long a[10],n,i,t;

int main()

{

n=0;

do 

{

cin>>a[i];

}

while ((a[i]==0) or (n==10));

for (i=1; i<=n; i++) cout<<a[i]<<" ";

cout<<endl;

t=0;

for (i=1; i<=n; i++)

if (a[i]%2!=0) t=t+a[i];

cout<<t;

return 0;

}

bạn có thể code bằng c căn bản chỉ dùng printf while vs for thôi đc ko bạn

anh chị giải giúp em với ạ, em đang rất cần sự giúp đỡ,  em cảm ơn ạ