Compilare: user.cpp: In function ‘int main()’: user.cpp:124:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); ++ i) { ^ user.cpp:127:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i > 0 && i + 1 < sol.size() && sol[i - 1] < sol[i] && sol[i] > sol[i + 1]) { ^ user.cpp:133:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + 1 == sol.size()) ^ user.cpp:53:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &N); ^ user.cpp:56:56: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &points[i].x, &points[i].y); ^ user.cpp:63:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &L); ^