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View Compilation Error

0_0_13156818_27083.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_13156818_27083.cpp:2:9: error: #include expects "FILENAME" or <FILENAME>
 #include
         ^
0_0_13156818_27083.cpp: In function 'int main()':
0_0_13156818_27083.cpp:9:16: error: 'scanf' was not declared in this scope
  scanf("%d", &n);
                ^
0_0_13156818_27083.cpp:18:16: error: 'pow' was not declared in this scope
    / ((pow(x3,2)-pow(x2,2))*(x2-x1)-(pow(x2,2)-pow(x1,2))*(x3-x2));
                ^
0_0_13156818_27083.cpp:27:22: error: 'printf' was not declared in this scope
   printf("%.2lf\n", s);
                      ^


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