Compilare: user.cpp: In function ‘int main()’: user.cpp:45:82: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n %d %d %d\n%d %d %d %d\n", &p, &n, &m, &t, &lin, &col, &k, &s); ^ user.cpp:47:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &x, &y); ^ user.cpp:53:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &cod[i][j]); ^