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HDOJ 2056

 1 #include<iostream>
 2 using namespace std;
 3 
 4 #include<algorithm>
 5 #include<iomanip>
 6 #include<cmath>
 7 
 8 int main()
 9 {
10         double x[4],y[4];
11         while(cin>>x[0]>>y[0])
12         {
13                 for(int i = 1;i < 4;i++)
14                 {
15                         cin>>x[i]>>y[i];
16                 }
17                 if(max(x[0],x[1]) <= min(x[2],x[3]) || max(x[2],x[3]) <= min(x[0],x[1]) || 
18 　　　　　　　　　max(y[0],y[1]) <= min(y[2],y[3]) || max(y[2],y[3]) <= min(y[0],y[1]))
19                         cout<<fixed<<setprecision(2)<<0.00<<endl;
20                 else
21                 {
22                         sort(x,x+4);
23                         sort(y,y+4);
24                         cout<<fixed<<setprecision(2)<<abs(x[2]-x[1])*abs(y[2]-y[1])<<endl;
25                 }
26 
27         }
28 
29         return 0;
30 }

第二种方法：

  1 #include<iostream>
  2 using namespace std;
  3 
  4 #include<cmath>
  5 #include<iomanip>
  6 
  7 
  8 typedef struct point
  9 {
 10         double x,y;
 11 }point;
 12 
 13 bool isIn(point p1,point p2,point p3)
 14 {
 15         int a,b,c,d;
 16         a = p1.x > p2.x?p2.x:p1.x;
 17         b = p1.x < p2.x?p2.x:p1.x;
 18         c = p1.y > p2.y?p2.y:p1.y;
 19         d = p1.y < p2.y?p2.y:p1.y;
 20         if(p3.x <= b && p3.x >= a && p3.y <= d && p3.y >= c) return true;
 21         else return false;
 22 }
 23 
 24 double area(point p1,point p2)
 25 {
 26         double x = fabs(p1.x-p2.x);
 27         double y = fabs(p1.y-p2.y);
 28         return x*y;
 29 }
 30 
 31 void swift(point &p1,point &p2)
 32 {
 33         int ta;
 34         if(p1.x > p2.x && p1.y < p2.y || p1.x < p2.x && p1.y > p2.y)
 35         {
 36                 ta = p1.y;
 37                 p1.y = p2.y;
 38                 p2.y = ta;
 39         }
 40 }
 41 
 42 void swift2(point &p1,point &p2)
 43 {
 44         int ta;
 45         if(p1.x > p2.x && p1.y > p2.y || p1.x < p2.x && p1.y < p2.y)
 46         {
 47                 ta = p1.y;
 48                 p1.y = p2.y;
 49                 p2.y = ta;
 50         }
 51 }
 52 
 53 int main()
 54 {
 55         point p1,p2,p3,p4;
 56         while(cin>>p1.x>>p1.y>>p2.x>>p2.y>>p3.x>>p3.y>>p4.x>>p4.y)
 57         {
 58                 point np1,np2;
 59                 swift(p1,p2);
 60                 swift(p3,p4);
 61                 np1.x = np1.y = np2.x = np2.y = -1;
 62                 if(isIn(p1,p2,p3) && isIn(p1,p2,p4))
 63                 {
 64                         np2 = p4;
 65                         np1 = p3;
 66                         cout<<fixed<<setprecision(2)<<area(np1,np2)<<endl;
 67                         continue;
 68                 }
 69                 else if(isIn(p3,p4,p1) && isIn(p3,p4,p2))
 70                 {
 71                         np2 = p2;
 72                         np1 = p1;
 73                         cout<<fixed<<setprecision(2)<<area(np1,np2)<<endl;
 74                         continue;
 75                 }
 76                 if(isIn(p1,p2,p3))
 77                         np2 = p3;
 78                 else if(isIn(p1,p2,p4))
 79                         np2 = p4;
 80                 if(isIn(p3,p4,p1))
 81                         np1 = p1;
 82                 else if(isIn(p3,p4,p2))
 83                         np1 = p2;
 84                 if(np1.x == -1 && np2.x == -1 && np1.y == -1 && np2.y == -1)
 85                 {
 86                         swift2(p1,p2);
 87                         swift2(p3,p4);
 88                         if(isIn(p1,p2,p3) && isIn(p1,p2,p4))
 89                         {
 90                                 np2 = p4;
 91                                 np1 = p3;
 92                                 cout<<fixed<<setprecision(2)<<area(np1,np2)<<endl;
 93                                 continue;
 94                         }
 95                         else if(isIn(p3,p4,p1) && isIn(p3,p4,p2))
 96                         {
 97                                 np2 = p2;
 98                                 np1 = p1;
 99                                 cout<<fixed<<setprecision(2)<<area(np1,np2)<<endl;
100                                 continue;
101                         }
102                         if(isIn(p1,p2,p3))
103                                 np2 = p3;
104                         else if(isIn(p1,p2,p4))
105                                 np2 = p4;
106                         if(isIn(p3,p4,p1))
107                                 np1 = p1;
108                         else if(isIn(p3,p4,p2))
109                                 np1 = p2;
110                 }
111                 else
112                 {
113                         if(np1.x == -1 && np1.y == -1)
114                         {
115                                 if(np2.x = p3.x)
116                                 {
117                                         np1.y = p4.y;
118                                         if(p1.x >= p3.x && p1.x <= p4.x || p1.x <= p3.x && p1.x >= p4.x)
119                                                 np1.x = p1.x;
120                                         else
121                                                 np1.x = p2.x;
122                                 }
123                                 else
124                                 {
125                                         np1.y = p3.y;
126                                         if(p1.x >= p3.x && p1.x <= p4.x || p1.x <= p3.x && p1.x >= p4.x)
127                                                 np1.x = p1.x;
128                                         else
129                                                 np1.x = p2.x;
130                                 }
131                         }
132                         else if(np2.x == -1 && np2.y == -1)
133                         {
134                                 if(np1.x = p1.x)
135                                 {
136                                         np2.y = p2.y;
137                                         if(p3.x >= p1.x && p3.x <= p2.x || p3.x <= p1.x && p3.x >= p2.x)
138                                                 np2.x = p3.x;
139                                         else
140                                                 np2.x = p4.x;
141                                 }
142                                 else
143                                 {
144                                         np2.y = p1.y;
145                                         if(p3.x >= p1.x && p3.x <= p2.x || p3.x <= p1.x && p3.x >= p2.x)
146                                                 np2.x = p3.x;
147                                         else
148                                                 np2.x = p4.x;
149                                 }
150                         }
151                 }
152 
153 
154                 cout<<fixed<<setprecision(2)<<area(np1,np2)<<endl;
155         }
156 
157         return 0;
158 }

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原文地址：https://www.cnblogs.com/maowang1991/p/2805741.html