Compilare: main.cpp: In function 'int main()': main.cpp:2:20: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses] #define MOD (1<<20)-1 ~~~~~~~^~ main.cpp:17:40: note: in expansion of macro 'MOD' sol[3]=(sol[0]+sol[2]+2*(i-2))&MOD; ^~~ main.cpp:8:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("12perm.in", "r", stdin); ^ main.cpp:9:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("12perm.out", "w", stdout); ^ main.cpp:10:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &n); ^