Compilare: main.cpp: In function 'bool can_add(int, int)': main.cpp:158:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return k - sol.size() - st.size() <= n - pos; ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'void find_ans(int, int)': main.cpp:200:11: warning: left operand of comma operator has no effect [-Wunused-value] debug(l, r); ^ main.cpp:131:21: note: in definition of macro 'debug' #define debug(...) (__VA_ARGS__) ^~~~~~~~~~~ main.cpp:203:8: warning: statement has no effect [-Wunused-value] main.cpp:131:20: #define debug(...) (__VA_ARGS__) ~~~~~~~~~~~~~ main.cpp:203:8: debug(mmax_pos); main.cpp:131:21: note: in definition of macro 'debug' #define debug(...) (__VA_ARGS__) ^~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:225:37: 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:226:39: 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); ^