Compilare: user.cpp: In function ‘int main()’: user.cpp:9:37: warning: ‘mp2’ may be used uninitialized in this function [-Wmaybe-uninitialized] long long a[n][m],b[n],c[m],mp1,mp2,m1=1000000000,m2=1000000000; ^ user.cpp:31:41: warning: ‘mp1’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=0;i<n;i++) a[i][mp1]*=(-1); ^