Compilare: user.cpp: In function ‘int main()’: user.cpp:192:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int32_t i = 0; i < v.size(); i++) { ~~^~~~~~~~~~ user.cpp:206:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int32_t i = 0; i < v.size(); i++) { ~~^~~~~~~~~~ user.cpp:93:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tower.in", "r", stdin); ^ user.cpp:94:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tower.out", "w", stdout); ^