Compilare: main.cpp: In function 'int main()': main.cpp:130:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sol.size() == n - 1) ~~~~~~~~~~~^~~~~~~~ main.cpp:109:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permsplit.in", "r", stdin); ^ main.cpp:110:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permsplit.out", "w", stdout); ^ main.cpp:112:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:119:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^