AtCoder Beginner Contest 103 A-D

太简单了，不写题解了。
A.Task Scheduling Problem

#include
#include
using namespace std;
int main()
{
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    if (aif (aif (bprintf("%d\n",a-c);
}

B.String Rotation

#include
#include
char s[1000],t[1000];
int n;
int main()
{
    int ok;
    scanf("%s%s",s+1,t+1);
    n=strlen(s+1);
    for (int i=1;ifor (int i=1;i<=n;i++)
    {
        ok=1;
        for (int j=1;j<=n;j++)
            if (t[j]!=s[i+j-1])
            {
                ok=0;
                break;
            }
        if (ok)
        {
            printf("Yes\n");
            return 0;
        }
    }
    printf("No\n");
}

C.Modulo Summation

#include
int main()
{
    int n,x,ans=0;
    scanf("%d",&n);
    while (n--)
    {
        scanf("%d",&x);
        ans+=x-1;
    }
    printf("%d\n",ans);
}

D. Islands War

#include
#include
using namespace std;
struct interval
{
    int l,r;
    bool operator < (const interval &i) const
    {
        return r200010];
int n,m;
int main()
{
    int now,ans;
    scanf("%d%d",&n,&m);
    for (int i=1;i<=m;i++) scanf("%d%d",&a[i].l,&a[i].r);
    sort(a+1,a+m+1);
    now=a[1].r;
    ans=1;
    for (int i=2;i<=m;i++)
        if (a[i].l>=now)
        {
            ans++;
            now=a[i].r;
        }
    printf("%d\n",ans);
}