Compilare: user.cpp: In function ‘int main()’: user.cpp:70:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i <= s.size()+1; i++) ~~^~~~~~~~~~~~~ user.cpp:71:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j <= s.size()+1; 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); ^