Compilare: user.cpp: In function ‘bool isPointInsidePoly(std::vector<point>, point)’: user.cpp:66:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < poly.size(); ++i) ^ user.cpp: In function ‘bool cmpYX(point, point)’: user.cpp:111:35: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return A.y < B.y || A.y == B.y && A.x < B.x; ^ user.cpp: In function ‘double polygonArea()’: user.cpp:144:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < p.size(); ++i) ^ user.cpp: In function ‘void readPolygons()’: user.cpp:35:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &nsize); ^ user.cpp:37:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf\n", &x, &y); ^ user.cpp:40:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &msize); ^ user.cpp:42:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf\n", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:151:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arie.in", "r", stdin); ^ user.cpp:152:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arie.out", "w", stdout); ^