Compilare: user.cpp: In function ‘int included(std::vector<int>&, std::vector<int>&)’: user.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (index_a != a.size() ^ user.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] && index_b != b.size()) ^ user.cpp:49:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index_b == b.size()) ^ user.cpp: In function ‘void solve(std::vector<int>&, std::vector<int>&, std::vector<int>, int)’: user.cpp:74:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); i++) ^ user.cpp:98:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:134:7: warning: unused variable ‘found’ [-Wunused-variable] bool found = 0; ^ user.cpp:113:32: 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:114:34: 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:116:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^ user.cpp:121:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^