Compilare: main.cpp: In function 'int main()': main.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n.size(); i++) ~~^~~~~~~~~~ main.cpp:51:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cifre5.in", "r", stdin); ^ main.cpp:52:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cifre5.out", "w", stdout); ^