Compilare: user.cpp: In function ‘int main()’: user.cpp:33:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&T,&R); ^ user.cpp:36:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&N); ^ user.cpp: In function ‘void mul(int)’: user.cpp:20:52: warning: array subscript is above array bounds [-Warray-bounds] for(int i=0;i<2;i++) mat[i][1]=tmp[i][1]; ^ user.cpp:20:42: warning: array subscript is above array bounds [-Warray-bounds] for(int i=0;i<2;i++) mat[i][1]=tmp[i][1]; ^ user.cpp:20:52: warning: array subscript is above array bounds [-Warray-bounds] for(int i=0;i<2;i++) mat[i][1]=tmp[i][1]; ^ user.cpp:20:42: warning: array subscript is above array bounds [-Warray-bounds] for(int i=0;i<2;i++) mat[i][1]=tmp[i][1]; ^