Codeforces 131A cAPS lOCK Solution in C

1. #include <stdio.h>
2. int main()
3. {
4. char ch[106];
5. int i,j,ck=1;
6. scanf("%s",ch);
7. for(i=1;ch[i]!='\0';i++)
8. {
9. if(ch[i]>=97&&ch[i]<=122)
10. {
11. ck=0;
12. break;
13. }
14. }
15. if(ck==1)
16. {
17. if(ch[0]>=65&&ch[0]<=90)
18. ch[0]=ch[0]+32;
19. else
20. ch[0]=ch[0]-32;
21. for(j=1;ch[j]!='\0';j++)
22. {
23. ch[j]=ch[j]+32;
24. }
25. }
26. printf("%s\n",ch);
27. return 0;
28. }

Codeforces 133A HQ9+ Solution in C

1. #include<stdio.h>
2. #include<string.h>
3. int main()
4. {
5. int i,n,p=0;
6. char s[120];
7. scanf("%s",s);
8. n=strlen(s);
9. for (i=0;i<n;i++)
10. {
11. if (s[i]=='H' || s[i]=='Q' || s[i]=='9')
12. {
13. p++;break;
14. }
15. }
16. if (p>0) printf("YES\n");
17. else printf("NO\n");
18. return 0;
19. }

Codeforces 160A Twins Solution in C

1. /// OmShantihari
2. /// Author: Sujan Mridha
3. /// CSE 5th batch, University of Barishal
4. #include <iostream>
5. #include <algorithm>
6. using namespace std;
7. int main ()
8. {
9. int i,n,m,b,c,s,a[200];
10. cin>>n;
11. for (i=0,s=0;i<n;i++)
12. {
13. cin>>a[i];
14. s+=a[i];
15. }
16. sort (a,a+n);
17. s/=2;
18. for (i=n-1,c=0,b=0;i>=0;b++,i--)
19. {
20. c+=a[i];
21. if (c>s) break;
22. }
23. cout<<++b<<endl;
24. return 0;
25. }

Codeforces 158B Taxi Solution in C++

1. #include <iostream >
2. using namespace std;
3. int main()
4. {
5. int n,m,g1=0,g2=0,g3=0,s=0;
6. cin>>n;
7. for (int i=0;i<n;i++)
8. {
9. cin>>m;
10. if (m==4) s++;
11. else if (m==3) g3++;
12. else if (m==2) g2++;
13. else g1++;
14. }
15. g1-=g3;
16. s+=g3;
17. if (g2%2==0 && g2>0)
18. {
19. s+=g2/2;
20. g2=0;
21. }
22. else if (g2%2==1 && g2>0)
23. {
24. s+=g2/2+1;
25. g1-=2;
26. }
27. if (g1>0)
28. {
29. s+=g1/4;
30. if (g1%4>0) s++;
31. }
32. cout<<s<<endl;
33. return 0;
34. }

Codeforces 546A Soldier and Bananas Solution in C

1. #include<stdio.h>
2. int main()
3. {
4. int i,a,c;
5. long int b,x=0;
6. scanf("%d%ld%d",&a,&b,&c);
7. for (i=1;i<=c;i++)
8. {
9. x=x+i*a;
10. }
11. if (x>b) printf("%ld\n",x-b);
12. else printf("0\n");
13. return 0;
14. }

Codeforces 116A Tram Solution in C++

1. ///SMS
2. #include <iostream>
3. using namespace std;
4. int main ()
5. {
6. int i,j,a,b,x=0,y=0,n,s=0;
7. cin>>n;
8. for (i=0;i<n;i++)
9. {
10. cin>>a>>b;
11. x-=a;
12. x+=b;
13. if (x>s) s=x;
14. }
15. cout<<s<<endl;
16. return 0;
17. }

Codeforces 122A Lucky Division Solution in C

1. ///SHS
2. #include <iostream>
3. using namespace std;
4. int main ()
5. {
6. int i,j,k,a[]={4,7,44,47,77,444,447,477,777};
7. cin>>k;
8. for (i=0;i<9;i++)
9. {
10. if (k%a[i]==0)
11. {
12. cout<<"YES"<<endl;
13. return 0;
14. }
15. }
16. cout<<"NO"<<endl;
17. return 0;
18. }