Compilare: main.cpp: In function 'int32_t main()': main.cpp:82:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define for0(i, n) for(int i = 0; i < n; ++i) main.cpp:264:8: for0(i, v.size()) for(int j = i + 1; j < v.size(); ++j) ~~~~~~~~~~~ main.cpp:264:3: note: in expansion of macro 'for0' for0(i, v.size()) for(int j = i + 1; j < v.size(); ++j) ^~~~ main.cpp:264:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for0(i, v.size()) for(int j = i + 1; j < v.size(); ++j) ~~^~~~~~~~~~ main.cpp:245:37: 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:246:39: 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); ^