Compilare: main.cpp: In function 'std::vector<int> knapsack(std::vector<int>&)': main.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size (); i++) { ~~^~~~~~~~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size () && i <= k; i++) { ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:72:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("grarbore.in", "r", stdin); ^ main.cpp:73:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("grarbore.out", "w", stdout); ^