Compilare: user.cpp: In function ‘int main()’: user.cpp:26:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:62:32: warning: iteration 301u invokes undefined behavior [-Waggressive-loop-optimizations] sum[i] += num2[j][i]; ^ user.cpp:60:5: note: containing loop for(int i = 0 ;i<600;i++) ^