Compilare: user.cpp: In function ‘void goodflows(int, int, int, const std::vector<int>&)’: user.cpp:99:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sons.size(); ++i) ~~^~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:163:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &k); ^ user.cpp:166:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &ncol); ^ user.cpp:168:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^ user.cpp:175:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^