Compilare: user.cpp:12: warning: non-local variable ‘<anonymous struct> SOL [420]’ uses anonymous type user.cpp: In function ‘int main()’: user.cpp:76: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:79: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int solve()’: user.cpp:69: warning: control reaches end of non-void function