Compilare: main.cpp: In function 'int32_t main()': main.cpp:174:9: warning: statement has no effect [-Wunused-value] main.cpp:131:20: #define debug(...) (__VA_ARGS__) ~~~~~~~~~~~~~ main.cpp:174:9: debug(fav_size); main.cpp:131:21: note: in definition of macro 'debug' #define debug(...) (__VA_ARGS__) ^~~~~~~~~~~ main.cpp:175:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(fav_size + 1 > dp[s[0] - 'a'][s.back() - 'a'].size()) ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:161:37: 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:163:39: 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); ^