Compilare: user.cpp: In function ‘int main()’: user.cpp:34:24: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] for(z=j-1;z>=j-k+1&z>=1;z--) prec[i][j][j-z+1]=prec[i][j][j-z]+a[i][z]; ^ user.cpp:26:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&k); ^ user.cpp:28:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(j=1;j<=n;j++) fscanf(f,"%d",&a[i][j]); ^