Compilare: main.cpp: In function 'int backtrack(const std::vector<int>&, std::vector<int>, int&&)': main.cpp:84:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define for0(i, n) for(int i = 0; i < n; ++i) main.cpp:160:7: for0(i, prime.size()) ~~~~~~~~~~~~~~~ main.cpp:160:2: note: in expansion of macro 'for0' for0(i, prime.size()) ^~~~ main.cpp:177:7: warning: unused variable 'res' [-Wunused-variable] int res = backtrack(prime, exps, last_index + 1); ^~~ main.cpp: In function 'int32_t main()': main.cpp:84:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define for0(i, n) for(int i = 0; i < n; ++i) main.cpp:210:8: for0(j, toate_primele.size()) ~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:210:3: note: in expansion of macro 'for0' for0(j, toate_primele.size()) ^~~~ main.cpp:221:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < prime.size(); j++) ~~^~~~~~~~~~~~~~ main.cpp:229:19: warning: statement has no effect [-Wunused-value] debug("got here"); ^ main.cpp:189:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".in", "r", stdin); ^ main.cpp:190:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".out", "w", stdout); ^