Compilare: user.c: In function ‘main’: user.c:45:21: warning: implicit declaration of function ‘abs’ [-Wimplicit-function-declaration] sum = dp[i + par - 1][j + par - 1] - dp[i - 1][j - 1] + ds[i + par - 1][abs(j - par) + 1] - ds[i - 1][j + 1]; ^ user.c:20:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ user.c:21:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&w); ^ user.c:36:23: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i][j]); ^