Compilare: user.c: In function ‘main’: user.c:22:14: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(j<M-1 && matrix[i][j+1]<matrix[i+1][j] || i==N-1){ ^ user.c:25:20: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] }else if(i<N-1 && matrix[i][j+1]>=matrix[i+1][j] || j==M-1){ ^ user.c:12:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^ user.c:13:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &M); ^ user.c:16:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%s", matrix[i]); ^