Compilare: user.cpp: In function ‘int main()’: user.cpp:55:10: warning: statement has no effect [-Wunused-value] for(k; k > 0; k--) ^ user.cpp: In function ‘int GetId(int, int, int)’: user.cpp:45:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:53:33: 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:58:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &l, &c); ^