Compilare: user.cpp: In function ‘int main()’: user.cpp:123: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int sol(int, int, int)’: user.cpp:42: warning: control reaches end of non-void function user.cpp: In function ‘int val(char)’: user.cpp:20: warning: control reaches end of non-void function