Compilare: user.cpp: In function ‘int solve(int)’: user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:110: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int solve(int)’: user.cpp:100: warning: control reaches end of non-void function user.cpp:63: warning: ‘v’ may be used uninitialized in this function