Compilare: main.cpp: In function 'void backt(int, int)': main.cpp:43:13: warning: unused variable 'ram1' [-Wunused-variable] int ram1 = n - pas - 1, s2 = s + i; ^~~~ main.cpp: In function 'int main()': main.cpp:57:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("scara2.in", "r", stdin); ^ main.cpp:58:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("scara2.out", "w", stdout); ^ main.cpp:60:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &h, &n, &m, &p); ^