Eroare de compilare: user.cpp: In function ‘bool area(std::pair<short int, short int>, std::pair<short int, short int>, std::pair<short int, short int>)’: user.cpp:20:11: error: expected initializer before ‘a’ int x a.first*b.second+b.first*c.second+c.first*a.second-a.first*c.second-b.first*a.second-c.first*b.second; ^ user.cpp:21:8: error: ‘x’ was not declared in this scope if(x<0)return 1; ^ user.cpp:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:27:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&N); ^ user.cpp:30:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&X,&Y); ^ user.cpp:33:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&X); ^