Compilare: user.cpp: In function ‘int main()’: user.cpp:21:12: warning: unused variable ‘x’ [-Wunused-variable] int n, x, y, cate=0, t; date aux, bux; ^ user.cpp:21:15: warning: unused variable ‘y’ [-Wunused-variable] int n, x, y, cate=0, t; date aux, bux; ^ user.cpp:22:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:24:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); cate=0; ^ user.cpp:26:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &v[i].st, &v[i].dr); ^