Compilare: user.cpp: In function ‘int main()’: user.cpp:67:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i < s.size(); i++) ~~^~~~~~~~~~ user.cpp:68:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=i; j < s.size(); j++) ~~^~~~~~~~~~ user.cpp:28:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld", &t); ^ user.cpp:31:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", c); ^