【HDU】 2020暑期杭电多校第八场

1003：Clockwise or Counterclockwise

叉乘：

#include 
#define rep(i,a,b) for(int i=a;i
#define T int t ;cin >> t;while(t--)
using namespace std ;
typedef long long ll;
typedef unsigned long long ull;
inline ll gcd(ll a,ll b){return b == 0? a:gcd(b, a % b);}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
ll Mode(ll a, ll b, ll mode)    {ll sum = 1;if(mode == 1)return 0 ;while (b) {if (b & 1) {sum = (sum * a) % mode;b--;}b /= 2;a = a * a % mode;}return sum;}
const int maxn = 2e5 + 10;
const int INF = 0x3f3f3f3f;
const double eps = 1e-11;
const ll mod = 1e9 + 7;
struct point{
	ll x , y ;
}a[10];point q,w ;
double cross(point a,point b)
{
    return (a.x*b.y-a.y*b.x);
}
int main(){
	T{
		cin>>a[1].x>>a[1].y>>a[2].x>>a[2].y>>a[3].x>>a[3].y; 
		
		a[4].x=a[1].x-a[3].x;
	    a[4].y=a[1].y-a[3].y;
	    a[5].y=a[1].y-a[2].y;
	    a[5].x=a[1].x-a[2].x;
		if(cross(a[4],a[5]) > 0)
			printf("Clockwise\n") ;
		else
			printf("Counterclockwise\n") ;
		
	}
	return 0 ;
}

1006：Fluctuation Limit

#include 
#define rep(i,a,b) for(int i=a;i
#define T int t ;cin >> t;while(t--)
using namespace std ;
typedef long long ll;
typedef unsigned long long ull;
inline ll gcd(ll a,ll b){return b == 0? a:gcd(b, a % b);}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
ll Mode(ll a, ll b, ll mode)    {ll sum = 1;if(mode == 1)return 0 ;while (b) {if (b & 1) {sum = (sum * a) % mode;b--;}b /= 2;a = a * a % mode;}return sum;}
const int maxn = 2e5 + 10;
const int INF = 0x3f3f3f3f;
const double eps = 1e-11;
const ll mod = 1e9 + 7;
ll n , k ;
struct qj{
	ll high,low ;
}a[maxn];
int main(){
	T{
		ll flag =  1 ;
		ll n , k ;
		scanf("%lld%lld",&n,&k) ;
		for(int i = 1 ; i <= n ; i++)
			scanf("%lld%lld",&a[i].low ,&a[i].high) ;
		ll xx , yy ;
		for(int i = 1 ; i < n ; i++){
			xx = a[i].low  - k ;
			yy = a[i].high  + k ;
			if(yy<a[i+1].low ||xx>a[i+1].high ){
				flag=0 ;
				break ;
			}
			else{				
				a[i+1].low=max(xx,a[i+1].low) ;
				a[i+1].high=min(yy,a[i+1].high) ;
			}
		}
		if(!flag){
			printf("NO\n") ; continue ;
		} 
		for(int i = n ; i > 1 ; i --){
			xx=a[i].low-k,yy=a[i].high+k;
			a[i-1].low = max(a[i-1].low ,xx) ;
			a[i-1].high =min(a[i-1].high ,yy) ;
		}
		printf("YES\n") ;
		for(int i = 1 ; i < n ; i++){
			ll ans = a[i].low  ;
			printf("%lld ",ans) ;
			ll l ,r ;
			l = a[i].low  - k ;
			r = a[i].high  +  k ;
			a[i+1].low = max(a[i+1].low ,l) ;
			a[i+1].high = min(a[i+1].high ,r) ;
		}
		printf("%lld\n",a[n].low ) ;
	}
	return 0 ;
}

1008：Hexagon

#include 
#define rep(i,a,b) for(int i=a;i
#define T int t ;cin >> t;while(t--)
using namespace std ;
typedef long long ll;
typedef unsigned long long ull;
inline ll gcd(ll a,ll b){return b == 0? a:gcd(b, a % b);}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
ll Mode(ll a, ll b, ll mode)    {ll sum = 1;if(mode == 1)return 0 ;while (b) {if (b & 1) {sum = (sum * a) % mode;b--;}b /= 2;a = a * a % mode;}return sum;}
const int maxn = 2e5 + 10;
const int INF = 0x3f3f3f3f;
const double eps = 1e-11;
const ll mod = 1e9 + 7;
ll n , k ;
struct qj{
	ll high,low ;
}a[maxn];
int main(){
	T{
		ll flag =  1 ;
		ll n , k ;
		scanf("%lld%lld",&n,&k) ;
		for(int i = 1 ; i <= n ; i++)
			scanf("%lld%lld",&a[i].low ,&a[i].high) ;
		ll xx , yy ;
		for(int i = 1 ; i < n ; i++){
			xx = a[i].low  - k ;
			yy = a[i].high  + k ;
			if(yy<a[i+1].low ||xx>a[i+1].high ){
				flag=0 ;
				break ;
			}
			else{				
				a[i+1].low=max(xx,a[i+1].low) ;
				a[i+1].high=min(yy,a[i+1].high) ;
			}
		}
		if(!flag){
			printf("NO\n") ; continue ;
		} 
		for(int i = n ; i > 1 ; i --){
			xx=a[i].low-k,yy=a[i].high+k;
			a[i-1].low = max(a[i-1].low ,xx) ;
			a[i-1].high =min(a[i-1].high ,yy) ;
		}
		printf("YES\n") ;
		for(int i = 1 ; i < n ; i++){
			ll ans = a[i].low  ;
			printf("%lld ",ans) ;
			ll l ,r ;
			l = a[i].low  - k ;
			r = a[i].high  +  k ;
			a[i+1].low = max(a[i+1].low ,l) ;
			a[i+1].high = min(a[i+1].high ,r) ;
		}
		printf("%lld\n",a[n].low ) ;
	}
	return 0 ;
}