Compilare: main.cpp: In function 'int main()': main.cpp:29:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.in", "r", stdin); ^ main.cpp:30:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("gfact.out", "w", stdout); ^ main.cpp:32:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &p, &q); ^ main.cpp: In function 'int l(int, int)': main.cpp:24:12: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized] return l; ^ main.cpp: In function 'int main()': main.cpp:17:30: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized] int st = 0, dr = 2e9, m, l; ^