Compilare: user.cpp: In function ‘void solve()’: user.cpp:24: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void write()’: user.cpp:69: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:80: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:83: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result