2017-9-9 NOIP模拟赛

站军姿

2bc*cosA=b^2+c^2-a^2

#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<iostream>
#include<algorithm>
const double pi=3.14159265358979323846264;
using namespace std;
void work()
{
    int x1,y1,r1,x2,y2,r2;
    scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&r1,&x2,&y2,&r2);
    double d=sqrt(abs(x1-x2)*abs(x1-x2)+abs(y1-y2)*abs(y1-y2));
    if(r1+r2<=d)//相离 
    {
        double ans=r1*r1*pi+r2*r2*pi;
        printf("%.3lf
",ans);
        return;
    }
    if(r1+r2>d&&abs(r1-r2)>=d)//内含 
    {
        double ans=max(r2,r1)*max(r2,r1)*pi;
        printf("%.3lf
",ans);
        return;
    }
    //相交 
    double ans=r1*r1*pi+r2*r2*pi;
    double j1=acos((d*d+r1*r1-r2*r2)/(2*d*r1));
    double j2=acos((d*d+r2*r2-r1*r1)/(2*d*r2));
    ans-=(r1*r1*j1+r2*r2*j2);
    ans+=d*r1*sin(j1);
    printf("%.3lf
",ans);
}
int main()
{
    //freopen("jh.in","r",stdin);
    freopen("standing.in","r",stdin);
    freopen("standing.out","w",stdout);
    int T;scanf("%d",&T);
    while(T--)
    {
        work();
    }
    return 0;
}

对刚

3

#include<iostream>
#include<cstdio>
#include<cstring>
#define maxn 100010
using namespace std;
int n,t,sum;
bool vis[maxn];
struct node{
    int nxt,pre;
}q[maxn];
int main(){
    //freopen("Cola.txt","r",stdin);
    freopen("resist.in","r",stdin);
    freopen("resist.out","w",stdout);
    scanf("%d%d",&n,&t);
    sum=n-1;
    for(int i=1;i<=n;i++){
        q[i].pre=i-1;q[i].nxt=i+1;
    }
    q[1].pre=n;q[n].nxt=1;
    int pos=1,cnt=0;
    while(sum){
        cnt++;
        if(cnt==t){
            q[q[pos].pre].nxt=q[pos].nxt;
            q[q[pos].nxt].pre=q[pos].pre;
            vis[pos]=1;
            sum--;
            cnt=0;
        }
        pos=q[pos].nxt;
    }
    for(int i=1;i<=n;i++){
        if(!vis[i]){
            printf("%d",i);
            return 0;
        }
    }
}

隔壁

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
#define maxn 1010
int n,m,a[maxn],b[maxn],c[maxn];
long long map[maxn][maxn];
long long ans1,ans2;
bool v1[maxn];
int main(){
    //freopen("Cola.txt","r",stdin);
    freopen("neighbor.in","r",stdin);
    freopen("neighbor.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)scanf("%d",&c[i]);
    for(int i=1;i<=m;i++)scanf("%d",&b[i]);
    for(int i=1,j=n;i<=n;i++,j--)a[i]=c[j];
    int mark;
    for(int i=1;i<=n;i++){
        bool flag=0;
        for(int j=1;j<=m;j++){
            if(b[j]==a[i]&&!v1[j]){
                v1[j]=1;
                ans1+=a[i];
                flag=1;
                break;
            }
            if(b[j]>a[i])mark=j;
        }
        if(!flag){
            ans1+=a[i];
        }
    }
    for(int i=1;i<=m;i++){
        if(!v1[i]){
            ans1+=b[i];
        }
    }
    cout<<ans1<<' ';
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(b[j]>=a[i])
                map[i][j]=a[i];
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(b[j]<=a[i])
                map[i][j]=b[j];
            ans2+=map[i][j];
        }
    }
    cout<<ans2;
    return 0;
}