Compilare: user.cpp: In function ‘void solve(std::vector<int>&, std::vector<int>)’: user.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (b.size() == n) ^ user.cpp:68:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] index<b.size() ^ user.cpp:59:7: warning: unused variable ‘current_size’ [-Wunused-variable] int current_size = b.size()*(b.size() + 1) / 2; ^ user.cpp: In function ‘int main()’: user.cpp:89:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sume.in", "r", stdin); ^ user.cpp:90:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sume.out", "w", stdout); ^ user.cpp:92:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^ user.cpp:97:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^