Compilare: user.cpp:23:0: warning: "mod" redefined [enabled by default] #define mod 1999999973 ^ user.cpp:18:0: note: this is the location of the previous definition #define mod 1000000007 ^ user.cpp: In function ‘int cb(int)’: user.cpp:34:16: warning: unused variable ‘mij’ [-Wunused-variable] int st=1,dr=n,mij,sol=-1; ^ user.cpp: In function ‘int cbd(int)’: user.cpp:49:16: warning: unused variable ‘mij’ [-Wunused-variable] int st=1,dr=n,mij,sol; ^ user.cpp: In function ‘int cbs(int)’: user.cpp:65:16: warning: unused variable ‘mij’ [-Wunused-variable] int st=1,dr=n,mij,sol; ^ user.cpp: In function ‘int cbd(int)’: user.cpp:61:9: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] return sol; ^ user.cpp: In function ‘int cbs(int)’: user.cpp:77:9: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] return sol; ^ user.cpp: In function ‘int main()’: user.cpp:94:12: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<cbs(x)<<"\n"; ^ user.cpp:92:12: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<cbd(x)<<"\n"; ^